When people talk about going back in time, it’s often to correct a mistake they or someone else made. But in Tom Kratman’s new urban fantasy flavored / sci-fi novel Dirty Water (hardcover, Kindle, audiobook), the main character is instead a grandfather just taking his kids on a field trip to see the world of his youth. In the following email interview, Kratman discusses what inspired and influenced this novel, as well as his plans for future fictional trips to the past.