Batman: Nightwalker by Marie Lu From Goodreads: Before he was Batman, he was Bruce Wayne. A reckless boy willing to break the rules for a girl who may be his worst enemy. The Nightwalkers are terrorizing Gotham City, and Bruce Wayne is next on their list. One by one, the city’s elites are being executed as their mansions’ security systems turn against them, trapping them like prey. Meanwhile, Bruce is turning eighteen and about to inherit his family’s fortune, not to mention the keys to Wayne Enterprises and all the tech gadgetry his heart could ever desire. But after a run-in with the police, he’s forced to do community service at…