Spyship

The British trawler Caistor has disappeared in the Barents Sea. Martin Taylor, son of the Chief Engineer, waits for news in the ship's home port. After the official search is abandoned, a private expedition to Norway is being organised by Tom Silvers, brother of one of the crew, but both British and Soviet Intelligence are determined to suppress public anxiety. As the official inquiry is announced, a lifebuoy is found by a Norwegian fisherman...

In Arctic Norway, Martin has found an ally in local journalist Erik Starvik. Back home, Suzy is in hospital after being attacked by Evans—and the information he forced out of her has put him back on Martin's trail.