The federal agent had a daring pitch for Nicolás Maduro’s chief pilot: All he had to do was surreptitiously divert the Venezuelan president’s plane to a place where U.S. authorities could nab the strongman.

In exchange, the agent told the pilot in a clandestine meeting, the aviator would be made a very rich man.

The conversation was tense, and the pilot left noncommittal, though he provided the agent, Edwin Lopez, with his cell number — a sign he might be interested in helping the U.S. government.

Over the next 16 months, even after retiring from his government job in July, Lopez kept at it, chatting with the pilot over an encrypted messaging app.

The untold, intrigue-filled saga of how Lopez tried to flip the pilot has all the elements of a Cold War spy thriller — luxury private jets, a secret meeting at an airport hangar, high-stakes diplomacy and the delicate wooing of a key Maduro lieutenant. There was even a final machination aimed at rattling the Venezuelan president about the pilot’s true loyalties.

More broadly, the scheme reveals the extent — and often slapdash fashion — to which the U.S. has for years sought to topple Maduro, who it blames for destroying the oil-rich nation’s democracy while providing a lifeline to drug traffickers, terrorist groups and communist-run Cuba.