So Long at the Fair (1950)

Director: Terence Fisher, Antony Darnborough
Cast: André Morell, Cathleen Nesbitt, David Tomlinson, Dirk Bogarde, Honor Blackman, Jean Simmons, Marcel Poncin, Zena Marshall

Synopsis:

Vicky Barton and her brother, Johnny, take a trip to the 1896 Paris Exhibition. They both sleep in seperate rooms in a hotel. When the sister gets up the next morning, she finds her brother and his room had disappeared and no one will even acknowledge that he was ever there. Now Vicky must find out what exactly happened to her brother.