The story by V. Valdman and N. Milstein tells about the complex and interesting work of police officers. The main characters - investigator Tuychiev and criminal investigation officer Sosnin, entering into a duel with inveterate criminals, invariably emerge victorious, because their spiritual qualities, their conviction in the rightness of their cause, are immeasurably higher than the base interests of people who break the law. This book is dedicated to those who stand guard today over our peaceful life.