Some physicist planned to make happy the world by the invention - to create the twin woven from anti-particles. On this twin it is possible to rewrite from some certain individual all his negative lines, all bad acts that burden memory and cause the overflow of bile. By the first object for an unheard of experiment a physicist elects the acquaintance - ordinary unlucky engineer-person. It is thus required an engineer to execute one-only condition - to beware meeting with twin, an annihilation explosion will happen otherwise. Twin, however, evolves and gradually goes out from under power of the creator...