In Agatha Christie’s classic mystery 4:50 From Paddington, a woman in one train witnesses a murder occurring in another passing one…in support of Miss Marple believes her tale.

For an instantaneous both trains ran side by side. In that freezing moment, Elspeth McGillicuddy stared helplessly out of her carriage windows as a guy tightened his grasp around a woman’s neck. Your body crumpled. Then your other train drew apart. But who, apart from Mrs. McGillicuddy’s friend Jane Marple, would consider her story seriously? After all, you can find no other witnesses, no suspects, no case — for there is no corpse, no one is missing.

Miss Marple asks her highly efficient and intelligent young friend Lucy Eyelesbarrow to infiltrate the Crackenthorpe family, who appear to be at the heart of the mystery, and help unmask a murderer.