Bob Stone (Dwayne Johnson), a former geek turned lethal CIA agent, returns home for his high school reunion. Claiming to be on a top secret mission, he enlists the help of former "big man on campus"-turned-accountant Calvin (Kevin Hart), who misses his glory days.

Before he realizes what he's gotten himself into, it's too late for Calvin to back out. Now the domestic number-cruncher is being dragged through an unpredictable world of deadly shoot-outs and espionage that could get both of them killed.