The Forgotten Garden by Kate Morton

In Brisbane, Australia, a passenger ship docks and the passengers disembark and disburse. A young girl of 4 is discovered on the docks by the wharf master, alone, sitting on a small suitcase. She doesn't know her name or where she is from. The wharf master takes her home and when, after several days, no inquiries are made about her, he and his wife decide to call her Nell and keep her as their own.

The Forgotten Garden is the story of Nell's life, with the mystery of her family origins at its center. The story moves back and forth between the early 1900s, the 1970s, and 2005, and incorporates Nell's ancestors and descendants into the story as the mystery slowly unfolds. It is a dark, gothic tale full of family secrets with themes of enchantment and faerie tales woven throughout. I really liked the the character of Cassandra, Nell's granddaughter, and her time spent at the atmospheric Cliff Cottage on the edge of the sea.