A group of disaffected students are shown a way out of their ennui (via a concoction he offers) by a man they meet at a café (the Eden of the title); Jourdan is supposed to have a night-time tryst with him at a factory but, on arriving for the appointment, she is intimidated by some of her fellow students and finds the man dead! Taking a clue from a postcard of an Arabian town found in the stranger’s pocket, Jourdan gets mixed-up in espionage (the MacGuffin in this case being a valuable missing portrait), games of a sexual nature, drug-induced hallucinations and murder; eventually, we come full circle and the story returns to the Eden and the arrival once again of the stranger…