Elements of a mystery

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1.
alias
2.
alibi
3.
cliffhanger
4.
clue
5.
crime
6.
deduction
7.
evidence
8.
science
9.
enforcement
10.
operendi
11.
setter
12.
motive
13.
perpetrator
14.
herring
15.
setting
16.
sleuth
17.
suspects
18.
victims
19.
weapons
20.
witness