Half a century has passed since Christopher Robin, a world-famous physicist famous for his theory of alternative universes, disappeared without a trace. And when, after the death of the scientist’s widow, an auction is held to sell his belongings, Alex Benedict, a dealer in space antiques, has a chance to lift the veil of secrecy surrounding the disappearance of the physicist. How and why did Christopher Robin disappear? Did the scientist really manage to discover the door to the parallel world that he had been looking for for a long time? And why does someone constantly put a spoke in the wheels to stop the investigation?