Small-town accountant Frank Bigelow takes a week's vacation in San Francisco prior to settling down with his fiancée Paula. But a night on the tiles leaves Frank with more than just a hangover ... Waking up, he is informed by doctors that he has been injected with a mysterious toxin for which there is no known antidote. At the outside, Frank has no more than a week to live. With no clue as to who should do such a thing or why, Frank sets out on a...