While classified as a novel, the book is based on the real life of Jeannette Walls' grandmother, Lily Casey Smith. Walls blends factual details with fictional elements to create a compelling narrative, acknowledging the blurring of lines between memory and historical accuracy.

"Half Broke Horses" serves as a prequel of sorts to Walls' acclaimed memoir, "The Glass Castle." Lily Casey Smith is the mother of Rosemary Smith Walls, a central figure in "The Glass Castle." Readers gain a deeper understanding of the family dynamics and values that shaped the characters and events depicted in the earlier memoir.

This book appeals to readers interested in historical fiction, strong female characters, and stories about the American West. Those who enjoyed "The Glass Castle" or the works of authors like Willa Cather and Laura Ingalls Wilder will likely find "Half Broke Horses" a captivating and insightful read.