Episodes 1–4 of High Volume adapt Frank Miller and David Mazzucchelli's Batman: Year One, a story that follows Bruce Wayne's first year as the vigilante Batman and James Gordon's struggles navigating Gotham City as an honourable man working amongst a corrupt police force.
Episodes 5–17 will adapt Jeph Loeb and Tim Sale's Batman: The Long Halloween, which centres around Batman, Gordon and Harvey Dent's efforts to catch a mysterious killer known as Holiday. The story culminates with Harvey Dent's scarring, both mentally and physically, and his transformation into Two-Face.
Episodes 18 onward will adapt Batman: Dark Victory, the direct sequel to The Long Halloween. It follows Batman, trying to catch another serial killer 'Hangman' and taking on a child protégé, 'Robin'.[5][6][3]
