Three friends, Nathan, Terry, and Gaz, plan an easy heist targeting the secluded mansion of elderly Dr. Richard Huggins and his wife Ellen. They hope to find a safe brimming with money and jewels while the homeowners are away. Unexpectedly, events take a turn when Nathan's girlfriend, Mary, shows up, arguing with Nathan over the criminal plot. Nevertheless, the group forces their way into the house and initially encounters no resistance. However, when Dr. Huggins and Ellen return earlier than expected, the simple robbery spirals into chaos as the elderly couple proves to be more cunning and resourceful than anticipated.

With the situation escalating, mistrust and paranoia grow among the friends, turning them against one another. What began as a straightforward burglary morphs into a harrowing ordeal of psychological manipulation and survival. The true nature of Dr. Huggins and Ellen is gradually revealed, showing they are far from helpless victims. Tension mounts as the young intruders experience increasingly bizarre and dangerous scenarios within the mansion. Facing unexpected challenges, they must figure out how to navigate the perilous situation they've found themselves trapped in as their plans fall apart.