The last voluminous book about the adventures of Ijon Tichy tells a story that takes place in a near future. Earthly superpowers send their arsenals and arms factories to the Moon, so that they can evolve there by themselves, leaving the Earth in a state of peace and welfare. The fear of what had been born from these arsenals forces international organizations to send Ijon Tichy in a secret mission to the Moon. Once there, the protagonist suffers from a strange accident: his brain becomes callotomized, i.e. the two hemispheres of his brain are separated. Tichy – in his psychical duality – becomes a puzzle to himself and his environment; he is also a deponent of a mystery he remains unaware of, desired by all intelligence services of the world.