"It's Halloween night in Gotham City, but Batman isn't getting any treats. A crime spree has Batman on the trail of the city's spookiest villains: Scarecrow, Clayface, Silver Banshee, and Solomon Grundy. They are all working for the Joker, who wants to unleash a computer virus and “digital laughter” that will give him control over all of Gotham City's technology! Joining forces with the Green Arrow, Cyborg, Nightwing, and Red Robin, can Batman save Gotham City? Find out in this thrilling chapter book with full-color interior illustrations!" -- Provided by publisher.