After Clive and Sonia discover that both of their partners are having an affair with each other, they both decide to have an affair themselves to try and put both of their marriages back together.
Melissa and Dave meet up in a hotel room. Elsewhere, Sonia decides the only way to stop Clive from telling Melissa what he knows is to kidnap him.
Sonia and Clive set out to stop Dave and Melissa's weekend romp. Meanwhile, Clive's mother decides that she is going to die at 10PM that night.
Everyone is shocked to find out that a detective named Clive Purvis, is following them.
Dave ends up having an affair with Kathy, even though he is still in love with Melissa. Meanwhile, Melissa decides to see a psychiatrist.
When Dave and Melissa rent a boat, Clive and Sonia follow them.
Just as Clive thinks he's got enough on his plate with his wife's affair and his friend Sonia trying to help end it, a new suitor enters the picture - Lester Whales, an exterminator.
Melissa decides to take up singing, so Clive decides to give the old banjo a try. Meanwhile, Purvis follows Dave and Melissa and Clive is followed by his secretary's husband.
Clive becomes suspicious by Melissa's sudden interest in singing.
Purvis begins following Melissa, but Clive is being followed by Lester. Then, Sonia and Clive decide to follow Melissa and Dave themselves.
Sonia and Clive's car breaks down on the way to the Drysdale cottage, thanks to Sonia and Dave.
Clive and Sonia find another couple when they arrive at the Drysdale's cottage. Meanwhile, Lester and Mrs. Whales decide to find out what Clive has been up to.
