Mona Dearly, a spiteful, loud-mouthed, unpopular woman dies when the car she is driving in plunges off a cliff and into a river near the small upstate New York town where she lives. Wyatt Rash, the local police chief, investivates and suspects foul play in Mona's death and tries to contain the whole town whom all are suspects who include Wyatt's daughter Ellen, who is going to marry landscape artist Bobby Calzone whose business was suffering from his lazy business partner, Jeff, Mona's slow-witted son, as well as waitress Rona Mace, who was having an affair with Mona's husband.

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