Cordelia and her friend Isaac investigate rumors of a monster on the loose in Central Park.

Ellen Potter is the author of more than twenty award-winning novels for children and young adults, including the Squirlish series, the Hither & Nigh series, Olivia Kidney, Slob, the Big Foot and Little Foot series, the Piper Green and the Fairy Tree series, The Humming Room, Pish Posh, and The Kneebone Boy. Several of her books have been chosen by the New York Public Library for their Best 100 Books for Children list and have appeared on numerous state reading lists. Her nonfiction writing book, Spilling Ink, A Young Writer’s Handbook, coauthored with Anne Mazer, was also chosen by the New York Public Library as a Best 100 Books for Children. Ellen lives in upstate New York with her family. For more information about Ellen and her books, visit EllenPotter.com.