When Eight Bells Toll by Alistair MacLean

A tough British intelligence officer is sent to a remote stretch of Scottish coastline to investigate a series of mysterious ship disappearances and bullion thefts; he uncovers a ruthless criminal ring using salvage operations and divers to loot gold shipments, navigates small-boat chases and violent betrayals, and mounts a dangerous undercover and military-style assault to stop the piracy and bring the culprits to justice.

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