The Third Twin: Ken Follett

Beautiful scientist Jeannie Ferrami stumbles across the baffling mystery of identical twins Steve and Dan, yet they were born on different days to different mothers - and one is a law student and the other is a convicted murderer. They are a world apart - but when Steve is accused of a terrible crime, Jeannie begins to question just how different they really are. As she begins to fall in love with Steve, not only her professional future is threatened - so is her life. They will uncover the mystery and bring the secrets to life, but some secrets were meant to be left alone.