Sigrid and her friend Gus returned from the planet Almoa to Earth. A lot has changed here during their absence. Now difficult and dangerous work is done for people not by robots, but by... tame monsters. They are uncomplaining, diligent, do not demand payment for their work, but they are very, very ugly. They also take their mission extremely seriously. And if some monster has been entrusted with an important task, then he will never fail it. It is precisely this monster, nicknamed Toad, that guards the bank into which Sigrid is to infiltrate. The fact is that unknown people kidnapped Gus and demand that the girl, in exchange for her friend’s life, get something very valuable for them...