Hotel Reserve is a 1944 British spy film starring James Mason as an innocent man caught up in pre-Second World War espionage.

Peter does some snooping and eavesdrops on a suspicious conversation between Paul Heimberger and the hotel's proprietor, Madame Suzanne Koch.

Heimberger explains that he was originally a Social Democratic newspaper publisher who was anti-Nazi and been sent to a concentration camp for two years.

Peter spots his camera in the pocket of a dressing-gown belonging to Odette and Andre Roux, a couple on their honeymoon.

The Radio Times noted, "this subdued thriller, set just before the Second World War, is lifted by James Mason's performance as a 'wronged man'," and concluded, "The plot has enough suspense and intrigue built in, but this movie only fitfully comes to life as Mason sets out discover who the real villain is";[2] Dennis Schwartz found it "a visually attractive film, though hampered because it's so slow moving";[5] whereas Leonard Maltin thought more highly of the piece, finding it a "Suspenseful, moody film.