When a real threat to the citizens of the Earth Federation emanates from the depths of Space, the time comes for the External Security Service to decisively intervene in the course of events. This time, the source of such a threat is the distant planet Zidra, where the mysterious Phoenix Corporation is in charge. Not only are thousands of people disappearing without a trace on Zidra, it turns out that the ominous trail of a new super-powerful drug leads there, gradually conquering all the surrounding worlds and approaching the Earth. External Security Service agent Oleg Egorov receives a secret mission to urgently go to Zidra to unravel its terrible secrets.