歐美漫畫界的傳奇，最獨特的說故事的人Alan Moore經典代表作之一，本書為這部經典蝙蝠俠漫畫的20週年紀念精裝版。

For the first time the Jokers origin is revealed in this tale of insanity and human perseverance. Looking to prove that any man can be pushed past his breaking point and go mad, the Joker attempts to drive Commissioner Gordon insane. After shooting and permanently paralyzing his daughter Barbara (a.k.a. Batgirl), the Joker kidnaps the commissioner and attacks his mind in hopes of breaking the man. But refusing to give up, Gordon maintains his sanity with the help of Batman in an effort to best the madman.