Monster (2005)

Barely coping with the everyday problems and her difficult young son who persistently insists that his disfigured rag doll threatens to gobble him up alive, an exhausted single mother is on the verge of an emotional breakdown. However, things will take a turn for the worse, when in the middle of the night, the mother will mistake a pale, yet menacing shadow for something that shouldn't exist in the apartment. Could her son be telling the truth?