Kirill Petrovich goes on a tour of European countries. But our hero only dreams of a calm life. Who tried to blow up an airship with hundreds of passengers? And was the purpose of this sabotage the life of the eminent Russian scientist who was flying under the protection of the hero to Paris? Will Kirill Petrovich be able to catch Jumping Jack, who has been hunted for more than sixty years? And who is hiding under the mask of this semi-mythical creature, spreading terror on the streets of London and its suburbs? In the middle of the North Sea, on a July night on board a luxury liner, a young beauty dies a monstrous death. A certain circle of people had a grudge against her, but who decided to take a desperate step? Kirill Petrovich is capable of finding answers to all these questions...