Detective Comics #985

"Then, Black Lightning, the Signal and Cassandra Cain are showing how well they work together but now they're up against a foe who can tap into their worst emotions and play them like music! When you've seen the kinds of horrors these poor souls have, there's plenty of trauma to work with and with that, you can turn these heroes into deadly weapons! Meanwhile, Batman's 'side project' has been revealed-what are the Brainiac Files, and what exactly does Batman plan to do with them?"