Found: His Perfect Wife — Marie Ferrarella

It was love at first sight for Alison Quintano when handsome stranger Luc LeBlanc saved her from a mugger. Ironically, he got hit on the head, losing his memory. When Luc awakened from the amnesia, Alison wanted to pay him back. He needed a favor, all right. For this once-spurned fiance needed a temporary wife to make a plan of revenge complete!
So Alison bravely agreed to accompany Luc to his Alaskan hometown as "Mrs. LeBlanc." But soon this marriage masquerade was stirring up too-real emotions, and Alison was uncovering the woman she'd always tried to deny. Could she convince this man that true love was the best revenge?