Lucky Starr and the Rings of Saturn

Lucky and Bigman Jones try to intercept a spy's secret message, but are captured by their enemies, the Sirians, and held prisoner in a secret military base on Titan.

Lucky Starr and the Rings of Saturn is the sixth book in the Lucky Starr series written by the legendary Isaac Asimov, author of I, Robot, Foundation, and the Galactic Empire series.

Earth officials were hard on the heels of the mysterious Sirian spy, Agent X, when he blasted off in a stolen spaceship. But before they could catch him, the master spy jettisoned the capsule that held his report into the icy rings of Saturn.

In a flash, Lucky Starr and Bigman Jones found themselves in a race with the Sirian war fleet to recover the top secret information ...