Pilot Alan Glenn in the new commander of Hero. His first trip is to check out an immobilized Soviet submarine, which as surfaced in the Arctic.

As Lt. Cmdr Beaumont considers taking unpaid leave for a yachting expedition, the HMS Hero encounters another lone yachtsman who's more experienced than he seems.

Ex Polaris submarine captain Edward Holt is in command of HMS Hero currently on duty in the Hong Kong area.

Whilst watching a naval helicopter exercise HMS Hero rescue a Chinese girl from the water. When they return to Hong Kong it is with the assistance of the police that the mystery starts to unravel.

HMS Hero is docked at Eddowes Island, which is about to be handed over from British rule. The locals are welcoming to the Hero's crew, but they're opposed to the handover, and some are resorting to violence. The Hero's crew are asked to help keep the locals in order, which worries Captain Holt, and Lt Napier in particular.