Conservative Henry Bell has been eased out of his job by condescending Bruce Tick, while wealthy and wildly eccentric Karen Knightly has been abandoned by her lover Anthony Staxton-Billing, who opted to return to his wife Imogen. Both are intent on committing
suicide by leaping from the
Tower Bridge in
London. When neither succeeds, they strike a bargain whereby each agrees to exact revenge on behalf of the other, although Henry is less enthusiastic about the plan. Karen, disguised as a frumpy
office temp, finds employment as an assistant to Tick and quickly derails his marriage by leading his wife Hilary to believe he's involved in an extramarital affair. Henry, meanwhile, is finding it difficult to keep his end of the bargain, since he has fallen in love with Imogen, the object of Karen's revenge. Instead of planning her demise, he begins an affair with the beguiling woman. Henry learns that Anthony left Karen not for Imogen, but for beautician Daphne Teal, and he begins to suspect Karen is more of a villain than a victim. The woman proves to be a formidable foe when she realizes Henry may renege on their deal. Adding to the humorous complications are Karen's oddball brother Oliver, who delights in racing through the interior of their rural
mansion on his
motor scooter; elderly and slightly befuddled housekeeper Winnie; and Daphne's very inept daughter Norma, who's being groomed to take over the household chores so Winnie finally can retire. ==Cast==