Two recent academy graduates join a battleship and confront the routines and hazards of shipboard life while tensions with a strict division officer revive an old personal quarrel. Their service draws them into secret operations and dangerous shore actions, leading to captured prisoners, a pitched naval engagement, a dramatic assault, and accusations that culminate in a court-martial. The narrative follows investigations, surprising discoveries, and a search for evidence that tests loyalties, exposes cunning maneuvers, and resolves the central disputes.