They Cracked Her Glass Slipper is a 1941 crime thriller novel by English writer Gerald Butler.

It follows the hardboiled style of his best-selling debut, Kiss the Blood Off My Hands.

It is Butler's only novel (aside from his 1972 comeback, There Is a Death, Elizabeth) not to have received an American publication (Farrar & Rinehart and its successor Rinehart & Company published all his other books in the United States).

In 1949 it was adapted into the British film Third Time Lucky with Butler developing the screenplay from his own novel.

Directed by Gordon Parry it starred Glynis Johns, Dermot Walsh and Charles Goldner.