The Partholon Books in Order

The Partholon books are where P. C. Cast first fully blended Oklahoma realism with high fantasy. The core Divine trilogy begins with Divine by Mistake, in which Shannon Parker, a high school English teacher from Oklahoma, buys an antique vase marked with the image of the horse goddess Epona. On the drive home she blacks out and wakes up in another world, wearing another woman’s face.

In Partholon, Shannon has been swapped with her double, Rhiannon, who serves as the Goddess Incarnate of Epona. Suddenly she is expected to lead rituals, marry a centaur shaman, and help defend a people menaced by monstrous Fomorians. Shannon’s bewildered, wisecracking voice keeps the story grounded as she learns to respect the faith of those around her and to own the power Epona offers, even while dark gods press in from the edges.

Divine by Choice and Divine by Blood complicate that setup. Shannon finds herself yanked back to Oklahoma just when she wants to stay in Partholon, and discovers that the threads between worlds run both ways. Old enemies slip through, new doubles appear, and the characters have to decide which loyalties matter most when your heart is split between two homes. Later, Divine Beginnings steps back to show how some of those tangled destinies were set in motion long before Shannon was born.

A second strand of the series jumps generations ahead with Elphame’s Choice and Brighid’s Quest. These novels follow Elphame, a daughter of the Goddess Incarnate, who is part human and part centaur, and Brighid, a proud centaur Huntress. Together with a band of settlers they attempt to reclaim MacCallan Castle, a fortress scarred by an old war with Fomorians. In these stories Partholon feels older and stranger: full of ruined strongholds, uneasy alliances, and half‑forgotten magic as characters struggle to make a new community out of survivors and outcasts.

Throughout Partholon, Cast returns to a few key ideas: that identity is more than bloodline, that goddesses and gods are powerful but not simple, and that love can grow in wildly unexpected shapes, including between species. Readers can expect battles, ritual magic, centaur culture, political intrigue, and a heroine who never quite stops thinking like an English teacher from Oklahoma, even when she is wearing a goddess’s mask.