After hours. Underground. Trapped. With real zombies.
Humble garbageman Vance Campbell is earning passes for his wife and daughter by working as a cashier at the local nerd convention when an earthquake literally shakes things up. His energetic supervisor ropes him into making a big cash deposit in order to get a ride with a pair of feuding celebrities, but when the elevator conks out, thirteen souls find themselves trapped in the mezzanine level, where something isn’t right. As they try to escape from underground, they find themselves being preyed upon by zombies with a taste for their brains, and they soon discover that more zombies are being created, and time is running out. They fight through the obstacles, but their own personal grievances threaten to overcome them at every step of the way. When they finally reach the ground floor and think they’ve escaped the horrors, they discover that their biggest test is yet to come, and they’ll have to defeat the biggest zombie ever to save themselves, and their families.