1. [n]  something that baffles understanding and cannot be explained; "how it got out is a mystery"; "it remains one of nature's secrets"
2. [n]  a story about a crime (usually murder) presented as a novel or play or movie

Mystery
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1. \Mys"ter*y\, n.; pl. {Mysteries}. [L. mysterium, Gr. ?,
   fr. ? one initiated in mysteries; cf. ? to initiate into the
   mysteries, fr. ? to shut the eyes. Cf. {Mute}, a.]
   1. A profound secret; something wholly unknown, or something
      kept cautiously concealed, and therefore exciting
      curiosity or wonder; something which has not been or can
      not be explained; hence, specifically, that which is
      beyond human comprehension.
            We speak the wisdom of God in a mystery. --1 Cor.
                                                  ii. 7.
            If God should please to reveal unto us this great
            mystery of the Trinity, or some other mysteries in
            our holy religion, we should not be able to
            understand them, unless he would bestow on us some
            new faculties of the mind.            --Swift.
   2. A kind of secret religious celebration, to which none were
      admitted except those who had been initiated by certain
      preparatory ceremonies; -- usually plural; as, the
      Eleusinian mysteries.
   3. pl. The consecrated elements in the eucharist.
   4. Anything artfully made difficult; an enigma.
   

2. \Mys"ter*y\, n.; pl. {Mysteries}. [OE. mistere, OF.
   mestier, F. m['e]tier, L. ministerium. See {Ministry}.]
   1. A trade; a handicraft; hence, any business with which one
      is usually occupied.
            Fie upon him, he will discredit our mystery. --Shak.
            And that which is the noblest mystery Brings to
            reproach and common infamy.           --Spenser.
   2. A dramatic representation of a Scriptural subject, often
      some event in the life of Christ; a dramatic composition
      of this character; as, the Chester Mysteries, consisting
      of dramas acted by various craft associations in that city
      in the early part of the 14th century.
            ``Mystery plays,'' so called because acted by
            craftsmen.                            --Skeat.
   

the calling of the Gentiles into the Christian Church, so designated (Eph. 1:9, 10; 3:8-11; Col. 1:25-27); a truth undiscoverable except by revelation, long hid, now made manifest. The resurrection of the dead (1 Cor. 15:51), and other doctrines which need to be explained but which cannot be fully understood by finite intelligence (Matt. 13:11; Rom. 11:25; 1 Cor. 13:2); the union between Christ and his people symbolized by the marriage union (Eph. 5:31, 32; comp. 6:19); the seven stars and the seven candlesticks (Rev. 1:20); and the woman clothed in scarlet (17:7), are also in this sense mysteries. The anti-Christian power working in his day is called by the apostle (2 Thess. 2:7) the "mystery of iniquity."