Roy and Gilbert's fishing trip takes a terrifying turn when the hitchhiker they pick up turns out to be a sociopath on the run from the law. He's killed before, and he lets the two know that as soon as they're no longer useful, he'll kill again. The two friends plot an escape, but the hitchhiker's peculiar physical affliction, an eye that never closes even when he sleeps, makes it impossible for them to tell when they can make a break for it.
An investigator from the War Crimes Commission travels to Connecticut to find an infamous Nazi, who may be hiding out in a small town in the guise of a distinguished professor engaged to the Supreme Court Justice’s daughter.
Francis, a young man, recalls in his memory the horrible experiences he and his fiancée Jane recently went through. Francis and his friend Alan visit The Cabinet of Dr. Caligari, an exhibit where the mysterious doctor shows the somnambulist Cesare, and awakens him for some moments from his death-like sleep.
As the Allied forces approach Paris in August 1944, German Colonel Von Waldheim is desperate to take all of France's greatest paintings to Germany. He manages to secure a train to transport the valuable art works even as the chaos of retreat descends upon them. The French resistance however wants to stop them from stealing their national treasures but have received orders from London that they are not to be destroyed. The station master, Labiche, is tasked with scheduling the train and making it all happen smoothly but he is also part of a dwindling group of resistance fighters tasked with preventing the theft. He and others stage an elaborate ruse to keep the train from ever leaving French territory.
Armed with only one word - Tenet - and fighting for the survival of the entire world, the Protagonist journeys through a twilight world of international espionage on a mission that will unfold in something beyond real time.