novel in which the reader is challenged to solve a puzzle before the detective explains it at the end

A dramatic representation of a Scriptural subject, often some event in the life of Christ; a dramatic composition of this character, A kind of secret religious celebration, to which none were admitted except those who had been initiated by certain preparatory ceremonies; -- usually plural, Something secret or unexplainable; unknown

having an import not apparent to the senses nor obvious to the intelligence; beyond ordinary understanding, of an obscure nature, Of or pertaining to mystery; containing a mystery; difficult or impossible to understand; inexplicable; obscure; not revealed or explained; enigmatical; incomprehensible