The Forgotten Garden by Kate Morton (2009)
Before the Great War, a small child ends up on the wharf in Australia. She won’t say or doesn’t know her name and no adult seems to be responsible for her. The kindly wharf agent takes her home to his childless wife, and there she remains.
Named Nell, and growing up in Australia unaware that she is not the biological daughter of her parents, Nell is a happy young woman until her father feels he must reveal to Nell her origins, or what he knows of them. Many years later Nell, and later her granddaughter, return to England to try to find out Nell’s true birth parents and how she came to be on that wharf in Australia. Their only clue a book of illustrated fairy tales packed into the small child’s suitcase Nell had with her when she was found.