Eleven-year-old Lucy Blake has just moved to Silver Hollow, a quiet little town with a long history of strange events. Lucy feels lonely in her new home until she meets Theo, a boy who seems to know every hidden corner of Silver Hollow—because he's a ghost. Theo died nearly 100 years ago, but he never found peace. Over time, Lucy and Theo form a close friendship, and eventually, Lucy realizes that she's fallen in love with Theo, despite the barrier of life and death.

Together, they search for a way to help Theo find peace, all while dealing with mysterious ghostly encounters, spooky adventures, and a town that harbors secrets. Lucy must also navigate her feelings and the reality of saying goodbye to Theo as he prepares to leave the earthly world forever.