Lily (13) loses her father in a car crash, which leaves her mother hospitalized. She is left to her own devices in the large, lakeside family mansion. In her father’s study, she discovers documents that shed new light ...展开on the past of her older sister Luna, who died 12 years before. One day, Lily finds a man locked in the cellar of the boathouse. His name is William, the main suspect in Luna’s murder. The young adolescent is quickly up in circumstances beyond her control, which leave her no choice but to head forward into maturity.