George Webber (Dudley Moore) is doing very well. He is a successful composer with a great house up in the hills above Los Angeles, a Rolls Royce and Julie Andrews for a girlfriend.
But then one day, driving his Rolls down Santa Monica Boulevard, he is visited by a vision – a preternaturally beautiful young woman (Bo Derek) in the next car. She turns to regard him, and he is instantly, helplessly, in love.
She turns away. She must be about her business. She is dressed in a bridal gown and is on her way to the church to be married. He follows her. He is stung by a bee in the church. He has six cavities painfully filled by her father, who is a dentist.
Groggy from pain pills and brandy, he finds himself aboard an aeroplane flying to Mexico — where, amazingly, he winds up at the same resort as his ideal woman – her name is Jenny – and, of course, her husband.
Jenny tries to repay him for a big favour, and her method of repayment causes George to rethink his whole approach to life.