Lilywhite Boys, book 2: Gilded Cage
K. J. Charles2019

Once upon a time a boy from a noble family fell in love with a girl from the gutter. It went as badly as you'd expect. Seventeen years later, Susan Lazarus is a renowned detective, and Templeton Lane is a jewel thief. She's tried to arrest him, and she's tried to shoot him. They've never tried to talk. Then Templeton is accused of a vicious double murder. Now there's a manhunt out for him, the ports are watched, and even his best friends have turned their backs. If he can't clear his name, he'll hang. There's only one person in England who might help Templeton now...assuming she doesn't want to kill him herself.