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On a train in Great Britain, Henry Camberley (Donald Wolfit) slays a fellow passenger and, in an effort to hide his involvement in the crime, takes devious measures to make it appear that another passenger, John Ryder (John Loder), is the murderer. Amateur sleuth Lord Peter Wimsey (Peter Haddon) hears the hubbub among his fellow passengers and, when he looks into the accusations against Ryder and realizes something is amiss, fixes to find the true killer. Wikipedia