Documentary series that puts the world's biggest conspiracy theories under the spotlight. Is it possible that a future pope turned a blind eye to Nazi war criminals escaping to South America after the war? Is there any truth in the theory that a Vatican insider poisoned Pope John Paul I? Was the KGB really behind the attempt to assassinate Pope John Paul II in May 1981? And was Roberto Calvi killed because he had helped the Mafia to launder money through the Vatican bank?