Police Major Igor Grom is known throughout St. Petersburg for his punchy character and uncompromising attitude towards criminals of all stripes. Incredible strength, analytical mindset and integrity — all this makes Major Thunder a real superhero. His life is perfect: during the day he catches criminals with his partner Dima Dubin, and spends the evenings in the company of journalist Yulia Pchelkina. The complete idyll is interrupted by the appearance in the city of a mysterious villain calling himself a Ghost. He offers Thunder to play a dangerous game, the stake in which is the lives of ordinary people.

In present day St. Petersburg, police major Igor Grom, an honest and skilled cop with unconventional methods, pursues a vigilante murderer in the mask of a plague doctor.