Anthill is a densely populated metropolis, a gigantic living building erected by a civilization that has long disappeared. Its monster-infested underground levels are said to extend so deep that they reach as far as Hell itself, but there are also exits to other inhabited worlds. Veta was found somewhere there, and she, timid and timid, grew up at the zero level of the Anthill, feeling like a mouse in someone else's house. But one day, on a whim, an officer of the Anthill guard takes her with him to the upper levels, giving her a job in the training unit of the guards. Now she has access almost everywhere. Just at this time, her friend’s brother goes missing. Will Veta, despite her fears and character, be able to help in his search? How will her relationship with the tough guards develop?