This volume is the 13th in the Batman Unhinged series, a tie-in comic based on the video game Batman: Arkham City. Created by writers including Derek Fridolfs, the series was initially serialized as digital chapters and later collected in print, using short stories to fill in the backgrounds of the villains and supporting characters of Arkham City. It is often regarded as a "worldbuilding supplement" to the game. In the story arc corresponding to this volume, the plot centers on a gang war between the Joker and the Penguin's factions within Arkham City, and involves the situation and choices of Roman Sionis, the Black Mask, behind Arkham's walls: he must face the person among his former associates he least wants to see, and weigh his position between the two camps. In addition, threads involving the Abramovici twins "Hammer" and "Sickle" advance at this stage; though no longer conjoined, the two are pushed to opposing sides. Note that chapter numbering in this series is not consistent across editions, and the correspondence between digital serial chapters and printed volumes is not uniform; the same story may appear in different collected volumes. Therefore, the specific start and end chapters of this volume should be determined by the table of contents of the physical copy in hand. The above synopsis only provides the series background and the approximate stage of this volume, without describing specific panels or plot points one by one.
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Derek Fridolfs (Chinese name: Derek Fridolfs) is an author known mainly for comics writing and children's books. Public information about him is limited, and his nationality, birth and death dates have not been clearly established. The library holds forty of his works, with the most common categories including children's books, comics and cartoons, art, film and television, literature, and foreign literature, showing that his writing spans comic storytelling and adaptations for young readers. Representative works include several volumes of the Batman: Lil Gotham series, Batman: Arkham Unhinged, Detective Comics No. 846: Heart of Silence Part One, and the English-language title Batman Unhinged. These works suggest that he specializes in stories built around classic characters such as Batman, with a style that tends toward light, visual, and youth-friendly adventure narratives, giving him a recognizable presence in superhero comics for general readers.