Lucky Starr and the Rings of Saturn

<b>From the front flap of the Gregg Press edition:</b> "Lucky Starr is in a tight spot - what his friend Bigman Jones considers the tightest of a danger-packed career as a member of Earth's Council of Science. For the first time Lucky and Bigman are face to face with the Sirians, Earth's most dangerous enemy. And he and Bigman are prisoners! <p>The scene: a great dome on Titan, one of the moons of Saturn. The occasion: Lucky's arrest by the Sirians for "invading" their domain in Earth's Saturnian system, which the Sirians are claiming by right of colonization. Lucky is up against Devoure, the unscrupulous nephew of the Director of the Sirian Central Council, and his great army of Sirian robots. Bigman sees no way out, and yet Lucky must find a way. Otherwise there will be an interstellar war - and Earth will be fighting without a single ally!"