When his family goes away for summer vacation, a hitherto faithful publishing executive with an overactive imagination is tempted by an attractive new neighbor.
A guy gets more than he bargained for after entering into an affair with the wife of an investment banker. Soon, a suspicious death and substantial life insurance policy embroil him in a scandal.
Tom McHugh quickly learns that his perfect big brother Craig isn't all he's cracked up to be while on a night on the town with the girl next door, during which Tom is harassed by unpleasant strangers, threatened by mobsters, pursued by police, attacked by an irate florist, accused of murder, and has his date kidnapped—all because everyone thinks he's Craig...and the classic 1959 DeSoto Firesweep he borrowed off his brother has two dead bodies in the trunk.
To help his divorced neighbor claim a substantial inheritance, a family man poses as her husband. The ruse spills over into his career in advertising, and his recent promotion relies on his wholesome and moral appearance.