Behind the Wall (2007)

For several generations the Parks family lived on a quiet hillside where Katelyn's grandfather and father were keepers to the town's lighthouse. At the tender age of ten, Katelyn watched her mom enter the basement in their lighthouse home where minutes later she was brutally beaten and found dying on the floor. Her father, Christopher, was arrested and convicted for the killing, and Katelyn placed in foster care out of town. The murder drove Christopher into madness and he was sentenced to a mental institution, where he later died. Katelyn never had a chance to speak to her father since that horrible night. Twenty years later, Katelyn recieves a mysterious letter which brings her back to the lighthouse home she swore she would never return to again. The town wants to open the lighthouse back up but someone from Katelyn's foggy past warns her to stop them! What they don't tell her is "why".