Question

What is a sleeper spy?

Answer 1

sleeper agent is a spy who is placed in a target country or organization not to undertake an immediate mission but to act as a potential asset if activated. ... Sleeper agents are popular plot devices in fiction, particularly in espionage fiction and science fiction. 

Answer 2

A sleeper agent is a spy who is placed in a target country or organization not to undertake an immediate mission but to act as a potential asset if activated. ... Sleeper agents are popular plot devices in fiction, particularly in espionage fiction and science fiction.