A heart donor delivery becomes a disaster, when the driver of the delivery van spots his girlfriend in the arms of another. Unable to resist he follows her through a succession of comic episodes and hurdles until he loses the heart completely and finds the mission, his love relationship and his sanity totally in jeopardy. An enraged cardiologist, the consummate professional, who accompanies him needles and prods him throughout for his foolishness. All ends well, saved at the last by the intervention of, ironically, the driver's brilliant girlfriend.