Renowned Detective Sexton Blake tackles his most perplexing case to date, a locked-room murder mystery with a crime scene a thousand feet below the Caribbean ocean!
Michael Moorcock's triumphant return to Britain's adventuring detective, Sexton Blake! His first published novel restored, revised, expanded. and presented with a brand new prequel story!

A deep sea mission.

A baffling murder.

Beneath a sky of limpid sapphire blue, the research ship Gorgon rolls gently on the scintillating waters of the Caribbean Sea.

Below, two men in a bathysphere, lowered more than a 150 fathoms into the crushing depths. But when the sphere is raised, there is only one man inside. and he has a knife in his back!

Now Sexton Blake must answer an impossible question: How did the killer escape?

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