In the bustling city of Saint Petersburg, Russia, Major Igor Grom, a daring and endearing detective with the St. Petersburg Police, finds himself in a gripping chase to capture a mysterious vigilante. The killer, dressed in a chilling plague doctor costume, has been unleashing chaos and terrorizing the innocent citizens. Determined to end the reign of fear, Igor uses his quick wits, unwavering resolve, and unconventional methods to get to the bottom of this chilling mystery. Along the way, he must navigate a tangled web of corruption, personal threats, and unexpected encounters that will challenge his morality and test his resolve.