A graphic novel which culminates the story-line where Batman (Bruce Wayne) and Catwoman (Selina Kyle) are set to get married
Batman and Wonder Woman are called to honor an old commitment to fight for Earth in a realm where time moves slowly so that an Earth hour could be years there
Batman: Preludes to the Wedding by Tim Seeley is a collection of stories where side characters in the Batman universe react to his upcoming wedding to Catwoman.