Found: His Perfect Wife (Men Made in America: Alaska #2)

When a woman's screams pierce the foggy night, Luc LeBlanc doesn't have to think twice about running to the rescue. Ironically, he gets hit on the head, and on regaining consciousness discovers that he has lost not only his wallet, but also his memory. Yet it's brought him a ministering angel, too... Alison Quintano owes her life to the nameless hero who saved her from a mugger. So by the time Luc finally remembers his identity and the predicament that made him leave Alaska, she feels duty bound to help him out. Even if it means accompanying this once-spurned fiance to his hometown and masquerading as his wife to make a plan of revenge complete!