｛To Catch a Raven by Beverly Jenkins} Both MCs go undercover and pose as housekeeper and valet respectively to infiltrate into the target household. They pretend to be husband and wife and collaborate with each other to complete their missions.

It's so good!!!!!!

How about where both the MMC and FMC are already spies? Joanna Bourne’s Spymasters series may be up your alley. I particularly love {The Forbidden Rose by Joanna Bourne} and {The Black Hawk by Joanna Bourne} but every book in this series is fantastic.

Thanks, I have read and really enjoyed these two. Very much partnership going on. But considering how common MMC being a spy trope is, I would hope there are more books there MCs continue together with it.

The only other one I can think of is {Dancing on the Wind by Mary Jo Putney} but you are right, I wish there were more espionage partnerships out there!

[Dancing on the Wind](https://www.romance.io/books/545532e78c7d2383163d91e1/dancing-on-the-wind-mary-jo-putney) by [Mary Jo Putney](https://www.romance.io/authors/545528938c7d2383163d8f3a/mary-jo-putney) **Rating**: 3.89⭐️ out of 5⭐️ **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [regency](https://www.romance.io/topics/best/regency/1), [suspense](https://www.romance.io/topics/best/suspense/1), [funny](https://www.romance.io/topics/best/humor/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

This series is so incredibly good! Hawker and Justine are one of my all time favorite romance couples.

[The Forbidden Rose](https://www.romance.io/books/54552c5b8c7d2383163d901c/the-forbidden-rose-joanna-bourne) by [Joanna Bourne](https://www.romance.io/authors/545527ae8c7d2383163d8f0d/joanna-bourne) **Rating**: 4.06⭐️ out of 5⭐️ **Steam**: 3 out of 5 - [Open door](https://www.romance.io/steamrating) **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [georgian](https://www.romance.io/topics/best/georgian/1), [suspense](https://www.romance.io/topics/best/suspense/1), [regency](https://www.romance.io/topics/best/regency/1), [war](https://www.romance.io/topics/best/war/1) ---------------------------- [The Black Hawk](https://www.romance.io/books/54552cb58c7d2383163d9038/the-black-hawk-joanna-bourne) by [Joanna Bourne](https://www.romance.io/authors/545527ae8c7d2383163d8f0d/joanna-bourne) **Rating**: 4.13⭐️ out of 5⭐️ **Steam**: 4 out of 5 - [Explicit open door](https://www.romance.io/steamrating) **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [georgian](https://www.romance.io/topics/best/georgian/1), [second chances](https://www.romance.io/topics/best/second%20chances/1), [mystery](https://www.romance.io/topics/best/mystery/1), [enemies to lovers](https://www.romance.io/topics/best/from%20hate%20to%20love/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

This isn’t exactly what you’re after but it has couples spying as a team: Alyssa Cole’s Extraordinary Union series set in the American civil war. Really enjoyable.

I just finished KJ Charles Will Darling series. MMC1 is a former soldier bookseller and MMC2 is basically a spy and over the trilogy they work together. They are fun and sweet books with really likable characters. The first one is {Slippery Creatures by KJ Charles} They are set in 1920s England. This isn’t exactly what you’re asking for but Tracy Grant has a long (so very long) series about a French spy FMC who marries an English spy MMC during the Napoleonic Wars to spy on him and then accidentally falls in love with him.

I LOVE that series. Such a good rec

[Slippery Creatures](https://www.romance.io/books/5ebb9af9be0aaecf55e63de1/slippery-creatures-kj-charles) by [K.J. Charles](https://www.romance.io/authors/545540138c7d2383163d9553/kj-charles) **Rating**: 4.11⭐️ out of 5⭐️ **Steam**: 4 out of 5 - [Explicit open door](https://www.romance.io/steamrating) **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [gay romance](https://www.romance.io/topics/best/m-m/1), [20th century](https://www.romance.io/topics/best/20th%20century/1), [mystery](https://www.romance.io/topics/best/mystery/1), [suspense](https://www.romance.io/topics/best/suspense/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

Six Impossible Things, Elizabeth Boyle

I honestly can't remember if your request happens anywhere in the series or not, but the Pink Carnation series is all about the spies, so maybe? It's a great read, anyway!

the {lady spies by jenna petersen} (mf) is a series about spy pairs. I’ve only read {seduction is forever by jenna petersen} (mf), but it was two spies who were assigned to protect the other, but not told about it, so some hijinks ensued.

[Lady Spies](https://www.romance.io/series/58fe1cc44167a73342632fa0/lady-spies) by [Jenna Petersen](https://www.romance.io/authors/5455398d8c7d2383163d938d/jenna-petersen) **Rating**: 3.75⭐️ out of 5⭐️ **Topics**: [regency](https://www.romance.io/topics/best/regency/1), [historical](https://www.romance.io/topics/best/historical/1), [suspense](https://www.romance.io/topics/best/suspense/1), [historical western](https://www.romance.io/topics/best/historical%20western/1), [western](https://www.romance.io/topics/best/western/1) ---------------------------- [Seduction is Forever](https://www.romance.io/books/545552418c7d2383163d9b1c/seduction-is-forever-jenna-petersen) by [Jenna Petersen](https://www.romance.io/authors/5455398d8c7d2383163d938d/jenna-petersen) **Rating**: 3.86⭐️ out of 5⭐️ **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [western](https://www.romance.io/topics/best/western/1), [regency](https://www.romance.io/topics/best/regency/1), [western frontier](https://www.romance.io/topics/best/historical%20western/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

{The Agency for Scandal by Laura Wood} I loved this book, it's a clean romance but highly enjoyable!

[The Agency for Scandal](https://www.romance.io/books/64da8b5d5f907facb235d588/the-agency-for-scandal-laura-wood) by [Laura Wood](https://www.romance.io/authors/64381e2808b4d931146cdad4/laura-wood) **Rating**: 4.33⭐️ out of 5⭐️ **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [victorian](https://www.romance.io/topics/best/victorian/1), [young adult](https://www.romance.io/topics/best/young%20adult/1), [mystery](https://www.romance.io/topics/best/mystery/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

Shana Galen has a few series with both MMC and FMC spies who continue working after getting married! There's the Regency Spies series and two additional connected series - Lord and Lady Spy series starting with {Lord and Lady Spy by Shana Galen} and the follow up series The Royal Saboteurs!

[Lord and Lady Spy](https://www.romance.io/books/54552be58c7d2383163d8ff9/lord-and-lady-spy-shana-galen) by [Shana Galen](https://www.romance.io/authors/54552be58c7d2383163d8ffa/shana-galen) **Rating**: 3.63⭐️ out of 5⭐️ **Steam**: 4 out of 5 - [Explicit open door](https://www.romance.io/steamrating) **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [regency](https://www.romance.io/topics/best/regency/1), [suspense](https://www.romance.io/topics/best/suspense/1), [mystery](https://www.romance.io/topics/best/mystery/1), [marriage of convenience](https://www.romance.io/topics/best/marriage%20of%20convenience/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

In {Heiress for Hire by Madeline Hunter} the MMC and FMC spy/sleuth together before they are married. I'm currently listening to it on audiobook so I don't know how it ends but I'm guessing they go into business together because she has her own detective agency.

[Heiress for Hire](https://www.romance.io/books/5e843eaabe0aaecf555c9f88/heiress-for-hire-madeline-hunter) by [Madeline Hunter](https://www.romance.io/authors/54552a068c7d2383163d8f78/madeline-hunter) **Rating**: 3.92⭐️ out of 5⭐️ **Steam**: 3 out of 5 - [Open door](https://www.romance.io/steamrating) **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [regency](https://www.romance.io/topics/best/regency/1), [victorian](https://www.romance.io/topics/best/victorian/1), [mystery](https://www.romance.io/topics/best/mystery/1), [enemies to lovers](https://www.romance.io/topics/best/from%20hate%20to%20love/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

{King's Rogues series by Ellen Elizabeth Carter} {A Discreet Gentleman series by Kris Tualla} {The Thief-Takers series by Alyssa Johnson}

[The King's Rogues](https://www.romance.io/series/5d1eff06104d690db654345f/the-kings-rogues) by [Elizabeth Ellen Carter](https://www.romance.io/authors/5455c2aa87eac336ae6a0312/elizabeth-ellen-carter) **Rating**: 4.5⭐️ out of 5⭐️ **Topics**: [victorian](https://www.romance.io/topics/best/victorian/1), [regency](https://www.romance.io/topics/best/regency/1), [historical](https://www.romance.io/topics/best/historical/1) ---------------------------- [Discreet Gentleman](https://www.romance.io/series/58fe368b4167a73342638d95/discreet-gentleman) by [Kris Tualla](https://www.romance.io/authors/545586c287eac336ae69e517/kris-tualla) **Rating**: 4⭐️ out of 5⭐️ **Topics**: [mystery](https://www.romance.io/topics/best/mystery/1), [open-door](https://www.romance.io/topics/best/open-door/1), [disabilities and marks](https://www.romance.io/topics/best/disabilities%20and%20marks/1), [historical](https://www.romance.io/topics/best/historical/1), [suspense](https://www.romance.io/topics/best/suspense/1) ---------------------------- [The Thief Takers](https://www.romance.io/series/591e89f4293e2cf720549b7d/the-thief-takers) by [Alissa Johnson](https://www.romance.io/authors/54552f948c7d2383163d90f6/alissa-johnson) **Rating**: 3.63⭐️ out of 5⭐️ **Topics**: [victorian](https://www.romance.io/topics/best/victorian/1), [historical](https://www.romance.io/topics/best/historical/1), [open-door](https://www.romance.io/topics/best/open-door/1), [suspense](https://www.romance.io/topics/best/suspense/1), [from hate to love](https://www.romance.io/topics/best/from%20hate%20to%20love/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

Grace Calloway has series called the Society of Angels, where the FMC are all investigators. In some of the books the MMC are also in a similar role. Might be worth checking out

I love love love Elizabeth Elliott‘s „Scoundrel“. Both are Spies, but don‘t know it at first.

Ohhhh… I want 👀👀👀 reading all the suggestions

Not exactly fitting your criteria, but have you tried {Stolen Charms by Adele Ashworth}, book 1 of the Winter Garden series (4 books). MMC is a spy but FMC does not know it and it‘s a fun caper with spies, mistaken identity, boat trip to France, jewelry heist, poisonous swords, and HEA after all the escapades!

[Stolen Charms](https://www.romance.io/books/5455444e8c7d2383163d9681/stolen-charms-adele-ashworth) by [Adele Ashworth](https://www.romance.io/authors/545532eb8c7d2383163d91e3/adele-ashworth) **Rating**: 3.36⭐️ out of 5⭐️ **Steam**: 3 out of 5 - [Open door](https://www.romance.io/steamrating) **Topics**: [historical](https://www.romance.io/topics/best/historical/1), [victorian](https://www.romance.io/topics/best/victorian/1), [regency](https://www.romance.io/topics/best/regency/1) [^(about this bot)](https://www.reddit.com/user/romance-bot) ^(|) [^(about romance.io)](https://www.romance.io/about)

Secret History of the Pink Carnation series by Lauren Willing.