Hide and Seek (2005)

After her mother commits suicide in the bathtub, Emily Callaway is taken to live upstate in new surroundings to forget her traumatic past. Psychologist David, her father, learns that his daughter has a new friend, the enigmatic, never to be seen, imaginary (or not?) Charlie. A deadly game of hide-and-seek ensues. Who is Charlie? And what is troubling David in his dreams?