Books like The Batman by Devan Aptekar

The Nightwalker series is a thrilling tale of Bruce Wayne's transformation from the Joker to Batman. When the city's elites are terrorized by the Nightwalkers, Bruce is forced to do community service at Arkham Asylum, but he meets Madeleine, a brilliant killer who may hold the key to stopping the villains. As the Nightwalkers close in on Gotham, Bruce must navigate the dark lines between trust and betrayal, with Madeleine as his only hope. This is a gripping journey into the world of Batman, following his rise from the Joker to the caped crusader.

The creature called Man-Bat escapes Arkham Asylum with a secret weapon and a sonar shriek that makes citizens turn batty, and it is up to Batman to keep Gotham City from becoming a city of bats. The creature called Man-Bat escapes Arkham Asylum with a secret weapon: a sonar shriek that makes citizens turn "batty." Can Batman keep Gotham City from becoming a "City of Bats"? Book #2

Someone has broken into Arkham Asylum hunting down all the supervillains locked up there, and Batman's life has just become more complicated because Gotham City's new mayor is the Penguin, and he has declared Batman an outlaw.

Batman invites young readers to solve a mystery in Gotham by following clues, making decisions and uncovering the truth about a series of bizarre crimes.

Batman strikes fear in the hearts of criminals, but there’s a killer stalking Gotham who’s even better at inspiring fright–and his method just might be unbeatable . . . because it’s invisible. Unbeknownst to the general public, a powerful new designer drug has hit the streets of Gotham, courtesy of an evil genius determined to turn the expression “scared to death” into lethal reality. Unlike the Caped Crusader, who petrifies only villains, this mastermind is targeting decent citizens–and he’s come up with the ultimate delivery system. After all, the public can’t refuse something they can’t see, hear, or smell. That’s the beauty of a terror toxin that is undetectable by the human senses. And with all of Gotham’s super-villains incarcerated, Batman must hunt down a mystery madman about whom he knows nothing. Maybe the Dark Knight should be afraid . . . because there’s plenty to fear when you go head-to-head with fear itself.

"As a pro wrestler, Killer Croc bullied his opponents inside the ring. As a cutthroat criminal, this ferocious freak forces his competition out of town. Next on his hoodlum hit list is Kite Man, but the second-rate super-villain isn't leaving Gotham without a fight. He's partnering with Batman, the world's greatest detective, to wrangle up the reptilian rogue and take him down for the count"--Page 4 of cover.

Batman and Batgirl fight off the Joker and Harley Quinn.

After the Joker’s death, the Riddler threatens Gotham with a deadly maze of destruction, recruiting Batman’s most ruthless enemies. Batman and Robin must thwart the scheme before the city falls into an unstoppable catastrophe.