Family Lies — Kathy Lynn Emerson

Ariadne Palmer, part-owner of an antiquarian bookshop in Maine, doesn't believe Clay Franklin when he tells her she has a twin sister and grandparents that she's never known. As a lawyer, Clay has sworn not to tell her the whole truth about her parents, but his immediate and growing attraction to her argues strongly against his promise. Originally published as a Silhouette Special Edition under the title SEPARATED SISTERS and the pseudonym Kaitlyn Gorton