The Grand Hotel Cortez is an old castle and the tale says that it is haunted. "Ghost" is the nickname of the famous jewels thief whom Jean-Marie Semolin wants to catch. Jean-Marie comes from France and he is sure that Ghost is among the hotel guests. A real ghost is haunting the place, a she-ghost, Maria Celeste Cortez. But the ghost has lost her shroud and she must find it. We can foresee some confusion.