Security guard Paul Blart is headed to Las Vegas to attend a Security Guard Expo with his teenage daughter Maya before she departs for college. While at the convention, he inadvertently discovers a heist - and it's up to Blart to apprehend the criminals.

Desperate to repay his debt to his ex-wife, an ex-con plots a heist at his new employer's country home, unaware that a second criminal has also targeted the property, and rigged it with a series of deadly traps.