Hunter, Denise, 1968- Summer Harbor series.

"She only remembers loving him. But he can't forget the way she left. Following a concussion, Lucy Lovett can't remember the last seven months of her life. She doesn't remember leaving her fiance Zac Callahan weeks before their wedding or moving to Portland, Maine. And she sure doesn't remember getting engaged to another man. All she remembers is loving Zac more than life itself. It's taken Zac months to move on after Lucy left him with no explanation. He's thrown himself into his family's farm and his restaurant business in Summer Harbor. Now Lucy's back, vulnerable, homeless, and still in love with him. She needs his help putting the pieces together, but letting her back into his life is a risk--and the stakes are high. If he follows his heart he'll win back the love of his life. But if her memory returns he'll lose her all over again"--