Rosemary and Rue, by Seanan McGuire, is the first of a series of books featuring the changeling character October "Toby" Daye. As the product of human and Faerie blood, changelings are not entirely welcome in either world, and although Toby once forged a place in Faerie as a knight for the Duke of Shadowed Hills, she has since repudiated all connections to that world. In fact, Toby apparently lived quite an event-filled life before the book even begins: she was engaged to and had a daughter with a human man before her "private investigator" status in Faerie landed her in a fourteen-year imprisonment in a koi pond. As the action begins, she works as a grocery clerk, is unable to speak to her daughter, and exists in a voluntary state of friendlessness. The setting may be fantastic but the action is a straight-up mystery, revolving around the death of one of Toby's old allies, Countess Evening Winterrose. The Countess has cursed Toby with discovering the truth of her murder with cold iron, and the task becomes a race against time as well as Toby's forceful reintroduction into the world of Faerie. Although there is a lot of (necessary) exposition and explanation of the laws of Faerie, etc., this is a solid series opener with some intriguing characters that left me hopeful that some of the many threads left hanging will be picked up in the next volume.