Q:Build a movie plot around this: Who is the mystery prisoner ? Elena's corpse and ghost is revealed to be the mystery prisoner.
A:
Tourist Lisa Reiner (Elke Sommer) wanders away from her tour group in Toledo to go shopping inside a store, where she encounters a man named Leandro (Telly Savalas), who is purchasing a dummy and a carousel Lisa attempts to buy. Due to his resemblance to the portrait of the devil in a fresco she has just seen, Lisa flees, only to be confronted by a mustachioed gentlemen...who falls from a flight of stairs to his apparent death.When she fails to find back to the tour group, she takes refuge with a couple and their driver, who agrees to help Lisa get to her hotel. But their car breaks down in front of a crumbling mansion where Lisa discovers that Leandro works as the butler. The couple (a young woman and older man) persuade Leandro to let them stay while the driver (the young wife's lover) fixes the car. Lisa attempts to flee, but the countess' son Maximilian (Alessio Orano) stops Lisa and agrees to let the three stay over the objections of his mother, a blind Countess (Alida Valli).The obscure, mustachioed man continues to stalk Lisa as further mysteries unfold: the Countess and her son have a fourth guest in the mansion, a mysterious figure who is held prisoner inside a secret room. The Countess, Maximilian, Leandro, and the mustachioed man (revealed to be Carlos, the Countess' second husband) claim that Lisa is actually,"Elena," Maximilian's long-lost girlfriend who was once frightened away by his jealous mother.Through a series of waking dreams, it is revealed that Elena was secretly sleeping with Carlos and that he was plotting to leave the jealous and reclusive Countess. After seeing Leandro preparing Carlos' body for burial juxtaposed with Carlos being alive, Lisa freaks out. Carlos attempts one last time to whisk Lisa away but Maximilian kills him. Lisa faints as Carlos' body morphs into the dummy Leandro purchased in the store. Leandro repairs the dummy (whose face has caved in, in the aftermath of the murder attempt).The driver is promptly killed by a mysterious figure after fixing the car....