The Black Bird Oracle is the fifth and final book in Deborah Harkness's beloved All Souls Series, published by Penguin Random House (Ballantine Books) on July 16, 2024. A #1 New York Times Bestseller, this 464-page novel continues the story of witch and scholar Diana Bishop as she faces a formal demand from the Congregation to test her seven-year-old twins' magical abilities.

Responding to an invitation from a previously unknown great-aunt, Gwyneth Proctor, Diana travels to Ravenswood, where she confronts her family's dark history and explores her own complex relationship with power. The novel blends paranormal romance with fantasy and historical fiction in the tradition of the series' earlier entries — A Discovery of Witches, Shadow of Night, The Book of Life, and Time's Convert.

The book is available in hardcover (ISBN: 9780593724798), paperback (published May 2025), large print, ebook, and as an audiobook narrated by Jennifer Ikeda (17 hours, 4 minutes).