What Beckoning Ghost

"A mystery that begins with the 1940 disappearance of a British submarine. The mother of the sub's commander claims to have met and talked with her son in the form of a ghostly apparition some months later in Hyde Park. A vagrant allso sees this meeting and, seven years later he is found drowned. Harvey Tuke, a sherry connoisseur, Mephistophelean look-alike and the rudest man in the Department of Public Prosecutions, becomes involved after he witnesses the strange behavior of remarried wife of the 'dead' commander at a party he is attending"