"Dying is what changed Mary O'Reilly's life. Well, actually, coming back from the dead and having the ability to communicate with ghosts is really what did it. As a third-generation Chicago cop, Mary knew the risks of being a police officer and didn't hesitate to step between a drug dealer's bullet and her beloved older brother, Sean. But instead of "going to the light" when she died on the operating table, she was given a choice-- a choice that would...