Petr, a Czech teenager, begins working as a trainee in theft prevention at a grocery store. He is criticized by his employer for being too conspicuous and then, when he suspects a man of stealing, he is too nervous to stop and confront the man so he just follows the man around and then returns home, where his father admonishes him because the shop manager had come looking for him. His father peppers him with questions about how he acted and why he did not do anything to stop the man.