mystery

US /ˈmɪs.tɚ.i/
UK /ˈmɪs.tɚ.i/
"mystery" picture
1.

something that is difficult or impossible to understand or explain

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The disappearance of the ancient civilization remains a mystery.
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It's a complete mystery to me how he managed to escape.
:
enigmapuzzleriddleconundrumsecret
2.

a novel, play, or movie dealing with a puzzling crime, especially a murder

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She loves reading detective mysteries.
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The new film is a gripping murder mystery.
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detective storythrillerwhodunitcrime novel
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mysteriousmystery play