Man in the Wall

Alva is a sad and lonely child. With her father locked up in prison, she moves with her mother and two older sisters to an apartment building in town. She does not like her new home. Her room is small and her sisters continue to exclude Alva from their games.
Soon a bizarre murder takes place in the building. A husband discovers his wife dead in the hall of their apartment, two weeks after she disappeared from their home.
As more disturbing things start to take place, Alva is drawn into a sick and twisted game by a killer who is hiding in plain sight. But Alva is just a child and has no idea just how deadly her new friend might be...