2.
This master of disguise.
3.
This curious investigator.
4.
This tricky operative.
7.
This devious double agent.
8.
This duplicitous mole.
10.
This undercover agent.
11.
This deceitful snoop.
12.
This sly infiltrator.
13.
This underhanded watcher.
15.
This surreptitious lookout.
17.
This slippery sleuth.
18.
And this very deadly assassin.
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