Dark Sheila is a poem written by Agatha Christie which was first published in Poetry of Today vol. 1 no. 3, May-June 1919. It was subsequently republished in the poetry collection The Road of Dreams in 1924. The first four lines are also quoted in the short story Harlequin's Lane where they are said to be from an old Irish ballad.
The theme of the poem is about love lost. Two man have left a woman. They both now plead with her because they want to come back to her, but she does not listen to them. Instead she chooses to go off to the moors where she hears the call of a "Shadow Lad" (presumably death).
- Poetry of Today is marketed as "The Poetry Review New Verse Supplement". The Poetry Review is where Christie published World Hymn about a month earlier.