At the age of nine, Cassie Malloy was kidnapped and locked in a basement for two days. Nineteen years later, the traumatized Cassie studies psychology at the Braxton University and needs to work on her thesis. Cassie decides to accept a four-week job working alone in an isolated fire watch tower in the forest to vanquish her demons from the past. Cassie leaves her best friend Andrea and travels to the spot, where she meets the forest guard Rhett that brings Cassie to the tower. Cassie feels the effect of the isolation and experiences weird things but she is comforted by Polly, the lookout of the east tower. When Rhett visits Cassie, she learns that Polly died five years ago in a fire. Cassie decides to quit her job, but Rhett recalls her that she signed a contract and he needs at least two days to find a replacement. Cassie agrees to stay while Andrea receives a strange phone call for Cassie.