First Edition. Trever Evans dustjacket art. Author's second book. Hubin listed crime novel and "case of dual personality, but, unlike Jekyll, John remains fully conscious of his change of identity. Despite this a powerful rivalry grows up between John, the successful business man, and Richard, the poor but brilliant author. Richard becomes, much to his own astonishment and against his will, the leader of a powerful Secret Society, composed of deaf mutes with a communistic aim". Near Fine in Very Good dustjacket, few inch closed tear and associated creases at lower rear panel.