The never-before-seen tale of The Joker's first night in Arkham Asylum is finally revealed! When a lunatic in a clown suit tries to poison Gotham City's reservoir and is placed in Arkham Asylum before his trial* Detective Jim Gordon realizes something's different about this new inmate that could forever change the future of Gotham. Backup: Rising-star artist Sweeney Boo joins the series as things get worse and worse for Punchline and Bluebird. Punchline's prison war against the Queen of Spades escalates* and no prisoner at Blackgate Penitentiary will be exempt from choosing sides. And after barely escaping death at the hands of Punchline's former accomplice* will Bluebird have the will to continue her investigation and find the mysterious woman from Punchline's past who has the answers she's looking for?