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Living in bustling New York City hasn't made Ada Santorini happy. Her success at work is overshadowed by a personal tragedy: two years ago, she lost her lover and daughter. To escape from her hard life, Ada decides to live in a houseboat on Lake Union in Seattle. There she suddenly comes across a mysterious chest that hides ancient secrets. Half a century ago, in this very place, young Penny Wentworth experienced a great love and suddenly disappeared. Ada solves the mystery of her disappearance with the help of Alex, a photographer who lives in a neighbouring house. Gradually, the woman learns a story that is strangely intertwined with her own. Will Ada have the courage to love again?