When a counterfeiting ring rocks London, the trail leads to a curiosity shop and a professor offering a treatment for 'absent-minded gentleman' - but can Detective Kenyon get to the bottom of the clever scheme?

Frank Heller was the pseudonym of Gunnar Serner, who was the first internationally famous Swedish crime writer. The son of a clergyman, to avoid arrest after a financial fraud he left Sweden for the continent. After losing the swindled money in a casino in Monte Carlo, he tried his hand at writing novels with immediate success, and produced forty-three novels, short stories and travelogues before his death in 1947.