Domino people. All the main tragic events of earthly history - wars, revolutions, political assassinations, mass deaths and epidemics - are the result of the dangerous activities of these people, because “for them, the history of mankind is just a game, and man is a figure in this game. With infinite patience, day after day, week after week, year after year, they line us up in long, oblivious rows, and one day the moment comes when they drop the first one with one instantaneous click. After him, everyone else falls, and then these people clap their hands with joy.” London and its inhabitants have been chosen as a new, unsuspecting victim in the next game of this game. The city is practically doomed, the only person who can prevent the impending fateful events is Henry Lamb, an inconspicuous London clerk to whom nothing remarkable has ever happened in his life. But he himself does not yet know what role is assigned to him on the playing field.