In November 1917, Zeppelin bombs rained down on a war-torn London, spreading fear and despondency throughout the capital. Then, one morning, the discovery of a headless torso in a residential square turned general anxiety into widespread terror. A cryptic note reading “BLODIE BELGIM” was found on the body, together with a number of intriguing clues. The case fell to Chief Detective Inspector Frederick Wensley of Scotland Yard, once dubbed “the greatest detective of all time.” If anyone could solve this perplexing mystery, he was the man.

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