The girl in the mirror / Rose Carlyle.

Identical twins only look the same... Beautiful twin sisters Iris and Summer are startlingly alike, but beyond what the eye can see lies a darkness that sets them apart. Cynical and insecure, Iris has long been envious of open-hearted Summer's seemingly never-ending good fortune, including her perfect husband Adam. Called to Thailand to help sail the family yacht to the Seychelles, Iris nurtures her own secret hopes for what might happen on the journey. But when she unexpectedly finds herself alone in the middle of the Indian Ocean, everything changes. Now is her chance to take what she's always wanted - the idyllic life she's always coveted. But just how far will she go to get the life she's dreamed about? And how will she make sure no one discovers the truth?