Betrogen.

From #1 New York Times bestselling author Sandra Brown comes another masterful creation, a riveting novel of suspense, revenge, and unpredictable twists and turns...Identical twins Melina and Gillian Lloyd haven't considered switching places since childhood. So when Melina proposes that Gillian take her place as a media escort to NASA astronaut Col. "Chief" Hart, she refuses...at first. The following morning Melina receives terrible news: her sister has been brutally murdered-and Chief, though innocent, is the prime suspect. He and Melina are determined to find the killer, a megalomaniac whose horrific schemes require Gillian's replacement, her identical twin-Melina.