The Operational Search Department, known as "The Bucket Squad", is one of the most top secret classified divisions in the Ministry of Foreign Affairs. Police Major Sergey Kovaliov, his assistant Maks Samedov and Detective Officers Aglaya Maksimova and Yekaterina Chepikova deal with dangerous criminals every day by going undercover as ordinary people, often unarmed. Constantly changing their identity, as each assignment requires, means the team is able to perform a wide range of tasks effectively - from searching an armed deserter to arresting the chief accountant of a huge financial organisation who has been embezzling company money for years.