Duke by Day, Rogue by Night (Nelson's Tea Trilogy #1)

Constance Danbury is fleeing an arranged marriage to lecherous Lord Burton, a man who has blackmailed her father and is nearly twice her age. Her escape takes her aboard a merchantman bound for Spain, where she hopes an aunt will help her procure funds to save her father’s dwindling reputation. But fate intervenes. Constance is captured by a pirate with a wit and stubbornness to match her own, and a secret he’ll do anything to keep.

Nobleman Percival Avery is a member of Nelson’s Tea, an elite group whose members are first sons from every tier in society. Undercover, he disguises himself as a pirate to infiltrate the gang of cutthroats responsible for his sister’s death. But when his vessel attacks a merchantman with valuable cargo, Percy is forced to choose between vengeance and saving the life of his commander’s niece, Constance Danbury. Mutiny is sure to obliterate his well-laid plans. It also aligns him with the one woman sure to see through his disguise. Forced to play the fop by day to outwit his enemies, he masquerades as a rogue by night in order to avenge his sister’s death – and to win his true love’s heart.