Cordelia and Isaac set out to solve a monstrous mystery at the Central Park Zoo in this exciting third installment of the "sweet and silly" (Booklist) Squirlish series perfect for fans of Sophie Mouse and Critter Club! Cordelia is a human girl raised by squirrels in Central Park and well-known among the park's other critters. When she gets an urgent message summoning her to the Central Park Zoo, Cordelia learns from the sea lions that a monster has been roaming the park grounds--something the size of a bear with glowing eyes!

With the help of her best friend, Isaac, Cordelia sets out to trap this mystery creature. They follow a string of questionable leads taking them to a dog park, a parade, and even an encounter with the New York Yankees! But can they find the Central Park Ghost?