"Blood of the Winter Solstice" is a fantasy novel that serves as the second installment in the Night Witch Series, particularly within the Widow's Watch Novel series. The plot centers around a powerful grimoire known as the Book of Belphegor, which is sought after by various characters for their own motives. The narrative unfolds during the Winter Solstice festival in northern Maine, where the stakes are high as witches and warlocks converge to seek the book, leading to potential conflicts and dark magic.
The Grimoire, described as being bound in human skin, contains potent spells and incantations that could cause great destruction if misused. Count Boris Sergev, the High Priest of the Obsidian Circle, is on a mission to recover the Grimoire, which has gone missing, as he fears it may be in the hands of a young witch.
Ultimately, the novel reflects on the characters' journeys and the challenges they face in the battle between light and dark forces. The fate of the Grimoire remains uncertain, setting the stage for further adventures in the ongoing struggle within the world of magic.