Premise: Hotel Reserve is a 1944 spy film starring James Mason as an innocent man caught up in pre-Second World War espionage. It was based on Eric Ambler's novel "Epitaph for a Spy". Unusually, it was both directed and produced by a trio: Lance Comfort, Mutz Greenbaum (credited as Max Greene) and Victor Hanbury.
Hypothesis: Hotel Reserve is from the 40s