Two stepsisters, vastly different in personality, must overcome their differences to solve a supernatural mystery plaguing their beach house. Dodie, fun-loving and perhaps a bit naive, arrives at a secluded beach house with the intention of bonding with her new stepfamily. She is immediately contrasted with her stepsister, Anne, who is described as cool and perfect. When both girls begin hearing unexplained footsteps on the stairs at night, their shared fear and curiosity propel them into an investigation that unearths a long-standing spectral dispute between two deceased sisters.

The premise sets up a classic mystery narrative with a supernatural twist, likely appealing to readers who enjoy ghost stories and tales of sibling bonding. The contrast between the two young protagonists suggests opportunities for character development and interpersonal dynamics as they work together. The resolution hinges on their ability to understand and pacify the spectral inhabitants, pointing towards a thematic exploration of unresolved past conflicts. The story appears designed to engage a young adult audience with its blend of relatable adolescent experiences and otherworldly phenomena.