Explosives experts are called only in the most difficult cases. They are not dealing with standard factory mines, but with homemade ones, the "behavior" of which is often unpredictable. And that's why there are only professionals among explosives experts. Among them are three retired captains of the Ministry of Internal Affairs – Viktor Seregin, Alexander Pekhota and Alexey Ternovsky, popularly known as Seryoga, Pekhota and Joker. And although they have already left the service in hot spots, they only dream of a quiet life: The Joker is taken hostage, the Infantry is accused of murder, the Earring's family is in danger, and suddenly their former colleague appears from the past, who once defected to the enemy.