1) Arcana 2) Enigmas 3) Secrets 1) Detective stories 2) Enigmas, puzzles 3) Some books 4) Tales of Hercule Poirot 
the secret ceremonies which took place during the Ancient Initiations, in which the candidates were taught the origin of things, the nature of the soul, and shown the births of worlds and systems by dramatic representations. They were divided into the Greater and the Lesser Mysteries.
one of the four parerga, referring to a divinely prompted 'understanding' of 'transcendent' 'objects' that incomprehensible by means of 'reason' alone. Kant examines the Trinity as his primary example.
• (pl. ) of Mystery • (pl. ) of Mystery
[Greek mythology] the Eleusian Mysteries, the secret religious rites celebrated at the ancient Greek city of Eleusis in honor of Demeter and Persephone.