The Clue of the Fourteen Keys

Fifteenth in the mystery series with Inspector Arnold and amateur detective Desmond Merrion. >The Assistant Commissioner of the Metropolitan Police is a member of London's exclusive Witchcraft Club and while there he encounters the corpse of the club secretary. He and the other twelve remaining members of the club are all suspects, to the embarrassment of the investigating Inspector Arnold. Only the intervention of his friend Merrion leads to the solving of the case.