About the book: 2003 / From the first pages of the novel, an avalanche of mysterious incidents, strange finds and amazing adventures, twisted by the authors into a tightly tightened knot, hits the reader . As fate would have it, the employees of the special laboratory receive a mysterious Indian dagger, the blade of which easily penetrates through any material, without causing harm to either the living or the dead. Where did this amazing weapon come from, what unknown danger was it forged against, and how did the unknown craftsman manage to achieve such amazing properties? Fantastic hypotheses, sea adventures, detective stories, the secrets of ancient India and the fight against dark forces make up the plot of this book, written by classics of Russian science fiction.