Fleeing an East Coast life marred by tragedy, Ada Santorini takes up residence on houseboat number seven on Boat Street in search of inspiration and new opportunities. When she discovers a trunk left behind by Penny Wentworth, a young newlywed who lived on the boat half a century earlier, she is immediately drawn into this long lost story. Ever-curious, Ada longs to know her predecessor's fate, but does not suspect that Penny's mysterious past and her own clouded future are destined to converge...