Philip Harding is a successful insurance executive but he is painfully shy in the company of girls. He fantasises about a girl he sees on the underground train but dare not speak to her. When promotion means he will have to move from London he realises he will not see the girl again. He plucks up courage and eventually they get together. But the girl has a big problem and Philip has to help. What follows is a dangerous game that takes our reluctant hero into situations he could not have dreamed of.