The funny and touching story of a divorced couple who have never fallen out of love. At curtain's rise, Bob, the ex-husband, is about to marry a young, rich, and uninhibited diet-faddist named Tiffany Richards. Complications set in almost immediately when he learns that he and his publishing house are going into the red. His friend and tax-lawyer summons Mary, the ex-wife, to help them go through cancelled checks dating back to the time of their marriage in the hope of finding some deductible expenses. With the arrival of the irrepressible, wise-cracking Mary on the scene, tax problems are almost forgotten in a nostalgic blood-bath of post-divorce jealousy.