spymaster
come in from the cold
secret agentry
notional
antiespionage
legend
hideling
invader
spooked
hole-and-corner
spookdom
spookocracy
cyberterror
agent-in-place
spookshow
penetrate
cut-out
clandestineness
hiddenness
covertness
spycraft
spyhopping
US Army Criminal Investigation Laboratory
ghost
industrial espionage
snooper
United States Army Criminal Investigation Laboratory
co-spy
hidingly
snoop
USACIL
U.S. Army Criminal Investigation Laboratory
under the table
MI5
secretive
infiltrator
countersurveillance
double agent
code name
foreign agent
undercover