The Folcroft Ghosts - Darcy Coates

When their mother is hospitalised, Tara and Kyle are sent to stay with their only remaining relatives. Their grandparents seem friendly at first, and the house, hidden in the base of the mountains, is full of nooks to explore. But strange things keep happening. The swing moves on its own. Doors slam and curtains shift when no one is inside. And one room is kept mysteriously locked. Something is being hidden away, kept safely out of sight... watching them. When a storm cuts the phone line - their only contact with the outside world - Tara and Kyle must find a way to protect themselves from their increasingly erratic grandparents... and from the ghosts that inhabit the Folcrofts' house.