The Celestial Plot
Adolfo Bioy Casares
 A soldier must pilot a new plane. He suffers an accident and is injured. He is interrogated and the army does not believe he is from Argentina. They mistake him for a spy. He calls his friends and nobody recognizes him. He cannot explain the situation, but a friend of his, the author, helps him. The author discovers the truth: he has travelled to a parallel universe, a little different from this.