The girl in the mirror : a novel
(Book)

Cynical and insecure, Iris has long been envious of her twin sister Summer's seemingly never-ending good fortune... including her perfect husband Adam. Called to Thailand to help her sister sail the family yacht to the Seychelles, Iris unexpectedly finds herself alone in the middle of the Indian Ocean. When she makes it to land, Iris allows herself to be swept up by Adam, who assumes that she is Summer. Now she has the golden life she's always envied, and is one step closer to the hundred-million-dollar inheritance left by her manipulative father. All Iris has to do is be the first of his seven children to produce an heir. How far will she go to ensure no one discovers the truth? -- adapted from jacket