Once upon a time, the terrible sorceress Plague del Tort tried to destroy little Tanya Grotter, but Ancient magic protected the girl and forced the black sorceress into another world - a mirror image of ours. The plague did not die there; it was able to survive and seize power there. Since then, her most passionate desire has been to escape from the twin world and take revenge. All that is needed for this is to destroy the thin and very strong boundary between realities. No force, no creature is capable of this! Except for the little gray bird – the bird of the titans. Only for her there is no time, no space, no physical barriers. If you kill her, the Glass of Worlds will collapse, and then Plague del Cake will show everyone! And the ideal candidate for the task... of course, is a girl who is like two peas in a pod and was raised specifically for this mission.