The Perfect Rake — Anne Gracie

She ran from a brute...
Fleeing violent tyranny, Prudence Merridew escapes with her beautiful younger sisters to London. One of them must marry -- and fast. To act as her sisters' chaperone, Prudence invents a secret engagement to a reclusive duke... But when the duke arrives unexpectedly in London, she needs his help to avert disaster.

...into the arms of a rake
Aristocratic Gideon, handsome, rakish and with a strong frivolous streak, casually hijacks Prudence's game, awarding himself a stolen kiss or three along the way. Used to managing sisters and elderly men, Prudence is completely out of her depth with a charming, devious and utterly irresistible rake. And her plot goes terribly -- if deliciously -- awry...