The Obsidian Mirror. The Witches of Hollomere, #2

The curse was only the beginning. Six months ago, Seraphina Locke inherited a house full of secrets and a ghost she's come to love. Now, the fragile peace she's fought to maintain is crumbling. Nathaniel Hawthorne is fading faster than ever, and her desperate attempts to save him are only feeding the curse that's consuming his soul. When Sera discovers her ancestor Isadora's true purpose-a ritual designed not to save Nathaniel, but to devour him-she realizes the key to his freedom lies in the hands of her family's greatest enemy: Silas Mortmain, a ruthless shadow-binder who will stop at nothing to destroy the last of the Locke line.
With the help of the reluctant Oakhaven Circle, Sera must master magic that defies everything she thought she knew. She'll need to turn attacks into strength, navigate a centuries-old blood feud, and pull off an impossible heist-all while Mortmain's shadows creep closer to Hollowmere's heart. But the Obsidian Mirror she seeks holds more than just a cure. It holds a hunger that could consume them all.
Perfect for fans of Practical Magic and The Ex Hex, this spellbinding sequel weaves romance, danger, and dark family secrets into an unforgettable tale of love worth fighting-and healing-for.