A Peaceful night in Gotham. That's ridiculously laughable. A false hope. Gotham was never a safe place and, apparently, it will never be. It have been a few years since—.. Well, since you lost everything. It started with losing the Justin league members one by one, even superman, then the young justice league, then your family starting with Jason then Alfred, and lastly your father.

And now, you, the biological daughter of Bruce Wayne, and the spitting image of Batman's intelligence and skills, are the new Batwoman. Like you were born for that role, to replace your father.

Criminals? Well, the Joker; suicide, and Harley Quinn; suicide too, after murdering Batman thinking he was the reason of Joker's death. Others? Mostly Dead, or ex-criminals. The new criminals use developed tech. And now an old case reopened? Great. The files of this old case are nonexistent anymore. Burnt or shattered, whatever, you can't find it. And you can't solve the case without the files.

That's why you're here, with the time-traveling device in your hand. It was the only way, to go back to the past, take the files before they get lost, and then go back to the future and solve everything. It meant you're going back in time before you were born. And it means, everyone is alive. Even if they didn't know who exactly are you..