[2] It stars Selina Cadell in the role of the disappearing Miss Froy, Tuppence Middleton as the young Iris Carr (who discovers the disappearance but is not taken seriously), Tom Hughes and Alex Jennings as Max Hare and the Professor, the two fellow English passengers who come to her aid.

[citation needed] It depicts a young English socialite, Iris Carr, travelling by train across 1930s Europe, returning to England from Croatia.

She enlists the help (initially given somewhat reluctantly) of the handsome young Max Hare, and his former Oxford Professor, who are travelling together on the train, for reasons unstated.

As in the book (but unlike the 1938 version of the film), Miss Froy is merely what she appears, and not a British agent of MI6.

The setting of the remake is the luxury express passenger train from Croatia to Trieste, rather than in the original fictional country.