Young Iris Carr is travelling back to England alone when she is befriended by governess Winifred Froy; taking tea in the dining car of their train, they return to their carriage, where Iris falls asleep. Upon awakening, she finds Miss Froy has disappeared and, more confusingly, that all the forriners sharing the compartment insist there never was such a lady to begin with. Might the attack of sunstroke Iris suffered on the platform before boarding be to blame, or might there be a more sinister explanation? Thus The Wheel Spins (1936) walks in the same furrow as a good many suspense stories, not least Phantom Lady (1942) by Cornell Woolrich and the Jodie Foster-starring Flightplan (2005).
The Invisible Event 