Oh no, this is not just a robbery! This is the beginning of a long chain of strange and sinister events — a chain of terrifying riddles and puzzles. Private detective Alexey Kisanov must solve them in just one month. That is the deadline given to him by a maniac named Benedict, on whose conscience lie twelve deaths. And if Kis does not show rare ingenuity, if his intuition fails him, then the thirteenth victim will be the woman he loves, his wife Alexandra... Elated by his first successes, Alexey soon realizes, however, that Benedict has led him into a dead end. An urgent correct solution must be found, and the price is Alexandra’s life.