T. Sviridov's action-packed novel takes the reader to the distant future. A group of adventurers who settled on the planet Dodarb and accidentally penetrated into the secrets of an unknown civilization intend to seize power in the Galaxy. The intelligence services of the Commonwealth of seven humanoid worlds send their best agents to fight them. The hero of the novel “Dangerous Cargo,” a professional intelligence officer demoted to co-pilot, discovers contraband cargo on a cargo ship—fuel for spaceships. The intelligence officer's rich experience tells him that this is not an ordinary commercial scam, but a real conspiracy to seize power on many inhabited planets