COLIN MILLER, recently separated, picks up his home phone to a strange CALLER who tells him his house has been turned into a bomb. Although entering isn’t a problem, crossing the threshold from the inside out will trip the detonator and blow up his house. Matters get worse when his soon-to-be ex-wife, JILL, barges her way in the next afternoon. Stuck in the house together, Colin and Jill are forced to face their problems and help each other through their toughest time as their lives tick away. Their only way out is to understand the clues given by the psychopathic Caller which is to remember his forgotten past in order to answer his question: Who Am I?