In 1774, Richard Bolitho is a newly appointed Third Lieutenant, joining the 28-gun frigate Destiny at Plymouth. It is a far step from midshipman's berth to wardroom, but his new captain soon points out that Bolitho's loyalty is to him, the ship and His Britannic Majesty - in that order.

Dispatched on a secret mission, Destiny and her company face the hazards of conspiracy, treason, and piracy. It is amidst the broadside battles and clashes of swords that Bolitho learns to accept his new responsibilities as a King's officer.