Source: dccomics.com

3. Batman: The Black Mirror

Sadly, this was not a comic book about Batman dealing with evil future technology in a clever parallel to modern society. No, this was Scott Snyder's “secret” Batman comic before his legendary run on Batman.

As the final storyline in the original Detective Comics run (before it was resurrected during Rebirth), this one brings back Batman Year One's James Gordon, Jr., the son of everyone's favorite mustachioed detective.

The son’s whereabouts were the enduring mystery, and it turned out that he was terrifying. James, Jr. returned to Gotham, where his history of mental un-health and possible ties to serial killings raised the ire of Batman. But not Bruce Wayne. No, this was when there were two active Batmans at the same time. And Detective Comics was the Dick Grayson Batman book.

The mystery played out in expert fashion, and the book really kept you guessing right up until the end.