A handwritten manuscript arrives at Felix Croft’s apartment on the island of Tenerife, where he fled his nightmare memories of The Handshaker. Written by master hypnotist, The Great Zepelli, it details the history of The Deep Secret, that mythical method of sending victims into a deep and instantaneous trance without uttering a word. From 1920s Heidelberg, through the war years, to modern day Britain, the race is on to uncover The Deep Secret and its promise of absolute hypnotic mastery.
