Vows and Vagabonds by Val Saintcrowe

Six of Crows meets Lore Olympus

Sefoni Rience needs a thief. Her cousin the queen has been tricked into giving up a bracelet, and if that bauble is found in the wrong hands, the queen’s reputation will be left in tatters. To get the bracelet back, she wants to hire Haid Vortinen, criminal mastermind, disgraced nobleman, sometimes known as the Lord of the Dead.
Haid agrees to steal back the bracelet, but only if Sefoni agrees to marry him.
Haid explains that she is the final piece to his master work—the perfect heist. He needs her at his side to complete it. Once it is done, he’ll retire and never steal again.
Sefoni’s not inclined to help the Lord of the Dead and his four other team members—a strumpet, a strongman, a lock picker, and their getaway driver—commit robbery.
But then, Haid’s not inclined to give her a choice.
When he publicly casts aspersions on her reputation, she’s ruined. Her only option is to become Haid’s wife and to be pulled into the criminal underworld. In six months time, the heist will be complete, and their sham marriage will end. She will be free.
Until that time, Sefoni must harden her traitorous heart. The one thing she cannot afford to do is to fall in love with her roguish, handsome husband.