October Daye is a fictional character created by author Seanan McGuire. She is a half-human, half-fae private investigator living in a world where magic and mythical creatures exist alongside modern society. The series follows her adventures as she navigates the complexities of both her human and fae heritage. The October Daye series blends elements of urban fantasy and mystery, featuring a rich cast of characters and intricate plots. The first book, titled "Rosemary and Rue," introduces readers to October's struggles and her quest to solve a murder that intertwines her fate with the fae community.