One morning there are no more dogs, cats, ferrets, guinea pigs, turtles … The teacher says to be calm, that a gravitational wave has hit the Earth but the pets will return. The boys of the fifth B are instead convinced that they have been kidnapped. As if that were not enough, Professor Boatigre has also disappeared. Something must be done immediately. Valerio throws himself into the investigation with the help of Carlotta and a telescope with extraordinary powers. Together they will discover the key to the mystery. But will the greats be able to hold the truth?