@Robert4787: Hidden under bridges, buried in forests, or tucked in plain sight—dead drops are the lifeblood of espionage. Discover how the CIA still uses this classic tradecraft, and how Corey Pearson trusts it when the stakes are deadly. #SpyThriller #CIA #Espionage https://t.co/t5pyJwCwa5 pic.twitter.com/ar3FKcNLlt