Twenty years later, Jackie unexpectedly inherits The Sandcastle and returns to the iconic estate for a short visit to ready it for sale. But she reluctantly extends her stay when she learns that, before her death, her estranged aunt had promised an up-and-coming producer he could record a tribute album to her late uncle at the property's studio. As her musical guests bring the place to life again with their sun-drenched beach days and late-night bonfires, Jackie begins to notice startling parallels to that summer long ago. And when a piece of the past resurfaces and sparks new questions about Willa's disappearance, Jackie must discover if the dark secret she's kept ever since is even the truth at all.