agent
business
businessman
clue
covert
csi
detective
discover
eye
eyes
film noir
find
hunt
inspector
investigate
investigator
looking
magnify
magnifying
male
man
men
mission
mysterious
mystery
old
people
person
private
scouting
search
searching
secret
security
see
seeing
seek
seeking
sight
sneak
solve
spy
spying
style
surveillance
tracking
undercover
vintage
vision
visual