Mad Maudlin (Bedlam's Bard‪)‬

Mary, Mary, Quite Contrary—and Quite Deadly …

Eric Banyon, better known as Bedlam's Bard, is finally about to graduate from Julliard and enter the Real World and so, with the help of a psychiatrist who specializes in the problems of magicians, he's finally coming to terms with his past.
But a spur-of-the-moment trip home to Boston to visit his parents brings him more trouble than even Eric thought possible.

Meanwhile, his Bardic apprentice Hosea has discovered that the young homeless children in New York's shelters have created a bizarre mythology about a demon called Bloody Mary who preys on young children—and somehow Bloody Mary has
taken on an independent life and now stalks the streets of the city. And for some reason, she's after Eric as well. …