Brimstone

Brimstone is a 2025 romantasy novel by British author Callie Hart, the second in her Fae & Alchemy trilogy and the sequel to Quicksilver (2024). Forever, an imprint of Grand Central Publishing, published the book on November 18, 2025, with Hodderscape releasing the UK edition. The novel appeared on The New York Times Best Seller list in 2025.