bringing to light
bugging
casual discovery
catching
chance discovery
cloak-and-dagger work
counterespionage
counterintelligence
detection
determination
determining
disclosure
discover
discovery
distinguishment
electronic surveillance
espionage
excavation
exhumation
exposure
find
finding
finding out
following
intelligence
intelligence work
invention
locating
location
looking
lookout
lucky strike
military intelligence
note
notice
observance
observation
recognition
rediscovery
regard
respect
revelation
scout
secret police
secret service
serendipity
shadowing
spotting
uncovering