Down-to-earth housewife Susan Henshaw is turning forty - and feeling ancient. Adding insult to injury is the return of gorgeous local hussy Dawn Elliott, rumored to have slept with half the married men of quiet Hancock, Connecticut. To lift her sagging spirits, Susan's loving husband throws her a surprise party. But one guest gets the surprise of her life - or death. Dawn Elliott is found murdered. And Susan herself is the prime suspect . . .