Tarnished Rose of the Court (Harlequin Historical Series #1110)

A dangerous mission at Queen Elizabeth's bidding is Celia Sutton's chance to erase the taint of her brother's treason. Her life is at risk if she's discovered—and so is her heart when she learns her co-conspirator is also her onetime seducer: brooding and mysterious John Brandon!

John can't believe the change in Celia—what's happened to the carefree English rose she once was? Leaving Celia was the only thing to do, but now guilt tears at his soul.

He has to heal the sadness in her past, and he's not above using anything—from expert seduction to royal favors—to achieve his goal.