The film "Locked Up" is a thriller about 8 prisoners held in isolated shacks in the forest. The film focuses on Shack 13, whose occupants unwisely decide to play a mysterious board game, unaware that it will curse them. As strange events begin occurring, one prisoner, Liana, works to save her sister Blair from the shack's effects and escape. The film explores the consequences of the characters' actions and the costs of meddling with forces beyond their control.