Tom Corbett Space Cadet #3: On the Trail of the Space Pirates:

Pirate stories are exciting enough, but a tale of piracy in the vast interplanetary spaces is a thousand times more thrilling than any story of the high seas or the Spanish Main.

This is the story of how Bull Coxine with his crew of cutthroat pirates came within an ace of taking control of the space lanes by threatening to destroy the great Solar Alliance, and how Tom Corbett and his two pals, Roger Manning and Astro of the Polaris unit, helped to foil the giant buccaneer's desperate scheme.