Lancelot is an outcast dog living and working at Les Chiens D’or, an exclusive kennels in New England. Nearby is Hades Chimneys, a horrific place that strikes terror into the hearts of all dogs and especially Lancey who managed to escape the Chimneys once, no thanks to Grimlock, a spiteful bull terrier.One day, Lancey is packed off to New York with a glamorous new owner to take part in a mysterious experiment. Soon his life is in danger and he is once again at the mercy of his old adversary Grimlock.