Stratagem (1970)

CIA agent Stella Turner goes undercover to seduce and recruit enigmatic tech savant Daniel Sim, whose genius may be the key to stopping a catastrophic leak of U.S. defense secrets. But the tables turn fast: Daniel is no ordinary target — he’s a master manipulator with a secret of his own. As the line between ally and adversary blurs, seduction turns into full-blown psychological warfare, and Stella finds herself walking into a trap of global proportions.