The CIA has been trying for years to capture and use ghosts for espionage agents, but when a mysterious mercenary gets there first and attacks an assembly of NATO top brass, the race is on to find out how it was done and if it can be replicated before the mercenary and his spectral assassins strike again.
The CIA gets a ghost agent of its own and quickly relearns the old adage about caution and wishes while Calley tries to make sense of his encounter with the entity that wiped out a NATO meeting.