Historical fiction (I still do not know how much of it is historically accurate) about the legal and commercial battles between Westinghouse and Edison during New York's Gilded Age: The Last Days of Night: A Novel by Graham Moore. (The youthful Moore has made quite a varied writing career for himself.)
I do know that Paul Cravath played a major role in the battles, and that Westinghouse promoted alternating current while Edison preferred DC. A good story with mythic underpinnings.