After multiple dirty bombs are detonated, spreading deadly toxic ash across Los Angeles, Brad (Rory Cochrane) inadvertently quarantines his wife, Lexi (Mary McCormack), outside their new home by safely sealing himself inside. With the city under siege and Martial Law in effect, Brad and Lexi struggle to survive with little supply, limited time and no information - all the while separated by thin doors and thinner sheets of plastic. When "help" finally does arrive, it appears to be anything but.