The Forgotten Garden by Kate Morton

This is a gem of a book that hooks the reader right from the first page. A little girl finds herself abandoned on a boat that is sailing from Britain to Australia in 1913. The book moves seamlessly back and for between 1913, 1975 and 2005 and spans four generations to try and solve the mystery of why she was abandoned and why no one came looking for her. The reader is drawn into a gripping and fascinating story which slowly fits together to reveal a frightening and horrific family secret.