Gold Was Our Grave — Henry Wade

Hector Berrenton returns home from hospital after a serious car accident to find a terse note: San Podino. This is yours. Fallon next.

Suspecting Berrenton's car has been tampered with, the North Sussex Police call in Scotland Yard. Chief Inspector John Poole, put in charge of the investigation, quickly discovers that three years earlier Berrenton and his partner, Jocelyn Fallon, had been on trial accused of fraud. The crime they were accused of was in connection with a Bolivian goldmine, San Podino, and though the two men were acquitted, a number of investors suffered considerable financial loss.

Soon Inspector Poole is dealing with attempted murder . . .