By John Dickson Carr, dramatised by Peter Ling. 
There is only one clue to a brutal killing on an ocean liner - the engraving on the murder weapon.

Dr Gideon Fell:………Donald Sinden Superintendent Hadley:………John Hartley Lord Sturton:……..Patrick Allen Captain Whistler:……..Clive Swift Curtis Warren:…….Mark Leake Peggy Glen:……Laura Bazeley

Also in the cast:……..David Bannerman…….Christopher Wright Duncan Knowles…….Josh Darcy

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