An Acceptable Time by Madeleine L'Engle

In this captivating tale, Polly O'Keefe finds herself unexpectedly transported back in time to a prehistoric era, where she encounters a group of Native Americans and a mysterious Celtic tribe. As Polly navigates this ancient world, she becomes embroiled in a conflict between the two groups, discovering connections to her own family history and grappling with the complexities of time travel. With the help of her scientist grandparents and a young man named Zachary, Polly must find a way to bridge the gap between the past and present, ultimately learning about the enduring power of love and understanding across time.

Purchase from Bookshop.org