The Folcroft Ghosts

When their mother is hospitalized, Tara and Kyle are sent to stay with their only remaining relatives. Their elderly grandparents seem friendly at first, and the rambling house is full of fun nooks and crannies to explore. But strange things keep happening. A bedroom remains locked at all times. Doors slam and curtains shift when no one is inside. And there are whispers of a sister who drowned in the lake long ago. Something is being hidden away, kept safely out of sight...and the children can't shake the feeling that it's watching them. When a violent storm cuts off their only contact with the outside world, stranding them in the haunted manor, Tara and Kyle must find a way to protect themselves from their increasingly erratic grandparents.
and from the ghosts that haunt the Folcrofts' house. All at once, they're forced to confront the secrets of the manor. But can they ever hope to escape the unforgivable secret that has ensnared their family for generations?