Middle-class suburbanites Larry and Kitty grow bored with their lives and respective marriages. Although each always found the other's manner grating, they fall in love when thrown together--without their spouses--on vacation. On returning home they try to break things off, only to grow closer. A holiday together will finally settle whether they should end their marriages.

An insurance detective encounters numerous surprises when he is assigned to investigate a meticulously-planned train robbery in Arizona.