For Teacake and Naomi, the wildest night shift of their lives begins when a mysterious fungal parasite breaks out in the self-storage store where they work. The highly dangerous microorganism comes from a sealed military base under the building - a relic of secret US experiments that was under lock and key for decades. But now it's spreading rapidly, turning humans and animals into zombie-like creatures. Time is running out - and it is now up to Teacake and Naomi with the help of an aging anti-bioterror agent to save humanity from its demise.