This early chapter book starring Batman and the Joker has forty pages and full color, comic-book style illustrations. Kids will love this adventure-filled story featuring a favorite and timeless superhero--The Dark Knight, Batman! The Joker has escaped from Arkham Asylum! He is planning to crash a birthday bash at the home of the Van Guilders and steal the famous Ghulpar Emerald. Will Batman arrive in time to spoil the Joker's plot?