Once the thriving attraction of rural Vermont, the Tower Motel now stands in disrepair, alive only in the memories of Amy, Piper, and Piper's kid sister, Margot. The three played there as girls until the day their games uncovered something dark and twisted in the motel's past, something that ruined their friendship forever.

Now adult, Piper and Margot have tried to forget what they found that fateful summer, but their lives are upended when Piper receives a panicked midnight call from Margot, with news of a horrific crime for which Amy stands accused. Suddenly Margot and Piper are forced to relive the time that they found the suitcase that once belonged to Silvie Slater, the aunt that Amy claimed had run away to Hollywood to live out her dream of becoming Hitchcock's next blonde-bombshell leading lady. As Margot and Piper investigate, a cleverly woven plot unfolds - revealing the story of Sylvie and Rose, two other sisters who lived at the motel during its 1950s heyday. Each believed the other to be something truly monstrous, but only one carries the secret that would haunt the generations to come.