I saw an interesting film about a girl that finds something like a metal box with a letter or something to that effect in the hole of a tree. She takes it inside I think and later senses or sees someone watching her from within the shadows of her bedroom - anywhere there are shadows this person gets close to her and also attacks her I think. She tells her Dad who doesn't believe her at first but then later she's hysterical after getting attacked again and so he installs a camera in her room. Eventually he sees the attacker for himself as well as the letter and tries to track him down. His daughter is held hostage inside the bowels of the tree while the father tries to catch the attacker and finally finds her in the tree and rescues her. The attacker was a little boy when he wrote that letter......anyways it was a great movie and I'd like to see it again. Anyone remember the title??? Thanks!!!