The third phase of Operation Citadel was quite confidently moving towards completion. Having managed to deceive the machine gun - the pursuer with the explosion of an abandoned ship, the friends continued to rush on their miniature ship to the target - the watchman lighthouse Q-18, to the most deaf and inhospitable outskirts of the Uranus planetary satellite system. There were still two weeks of flight ahead and the crew of the boat had enough time to carefully prepare for painless penetration of the patrol lighthouse.