fter lecturer Valentine Lyall falls to his death fro a Cambridge university chapel roof Geordie calls in ex college alumnus Sidney to help on the case. Valentine and student colleague Kit Bartlett shared a penchant for climbing high buildings but a witness is sure that the victim was pushed. After Geordie has been threatened by a gun-toting woman college master Montgomery informs him that Lyall was a British spy in pursuit of a Russian agent, the Tsar. Sidney and Geordie need to identify them and thus find the killer, whilst Sidney is still dealing with the aftermath of the Redmond death and starts dating forthright police clerk Margaret Ward.

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