Naoki Urasawa's monster 12

The Nameless Monster, the mysterious picture book which holds the key to unlocking Johan's past, was created by an official from the Czechoslovakian secret police. This startling discovery leads to the mysterious Red Rose Mansion--an estate with a dark and tragic history covered up and sealed away for decades. Meanwhile, the serial murderer in Prague has been identified as a beautiful blond woman. Who could she be and what is her connection to Johan?