In the fourth book of the fantastic saga “Mutangels”, the super mutant Rizengri ends up on one of the amazing planets - Earth-4, whose inhabitants unanimously do not remember during the day what they did at night. Rizi, on the instructions of the angels, must find his friend Dyushka, and finds the beautiful Elina, whose father, it seems, managed to unravel a couple of universal secrets. But will Masha Malinina and Rino Sluns, whom fate has thrown into an even more amazing place, be able to unravel their secret? And what will happen to Varya Voronina when she meets Prince Kirill? Perhaps the angels or Bream Mymbe, who turned into a rat, know the answers to all these questions.