Detective Comics # 986

Black Lightning, the Signal and Cassandra Cain are working very well together...but now they're up against a foe who can tap directly 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?