A wave of mysterious robberies is sweeping the country, and fifty thousand pounds worth of diamonds has been stolen in six months. During the fourth raid,a nightwatchman is attacked with chloroform, and just manages to gasp out The Green Finger before he dies.

Chief Inspector Dale has heard the enigmatic phrase before: it was the last utterance of a drowning man wanted in connection with another robbery. But with no further leads, the police are baffled. The cry goes out in the popular press: Send for Paul Temple!

A wave of mysterious robberies is sweeping the country

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