- Published: 9 December 2025
- ISBN: 9781496754097
- Imprint: Kensington
- Format: Hardback
- Pages: 384
- RRP: $60.00
The Book of Autumn

















- Published: 9 December 2025
- ISBN: 9781496754097
- Imprint: Kensington
- Format: Hardback
- Pages: 384
- RRP: $60.00
Praise for The Book of Autumn
“O’Sullivan’s sun-drenched debut sheds an unexpected light into the shadowiest corners of dark academia. A poignant portrait of power, prestige, and personal growth, O’Sullivan masters the delicate balance between dire cosmic consequences and visceral, character-driven intimacy. Autumn's magic feels a fingertip away.” —A. Rae Dunlap, author of The Resurrectionist
“Ancient magic, gruesome murder, a second-chance romance to die for, and a setting so vivid, you can feel the desert air on your skin and smell the horses. The Book of Autumn is a masterclass in contemporary fantasy: suspenseful, clever, and atmospheric.” —Genoveva Dimova, author of Foul Days
“A refreshingly sunbaked dark academia set amidst the mesas and ranches of New Mexico, O’Sullivan’s debut is scorching with romance and magic, ambition and power, and the insidious nature of grief.” —Francesca May, author of Wild and Wicked Things
“A stunning debut, with one of the best mystery twists! O’Sullivan artfully blends dark academia and a unique magic system with a second-chance romance, making this debut unputdownable.” —Alysha Rameera, author of Her Soul for a Crown