Oleg Kovaly, a regular inspector of Accident Expertise (ENES) of the second class, is sent by the Department from Earth to Mars for another examination. Three accidents in the heart of the Xanth Land area, outside and inside the residential dome, with a short interval between them. Are these the first murders in the last fifteen years? What awaits the inspector on the way to the Red Planet? And why was he chosen for this task? Oleg Koval will have to find out the answers to these questions and at the same time try not to die.