Nightwing: A Darker Shade of Justice #1

Since relinquishing the Robin costume and persona, Nightwing has attempted to become his own man outside the shadow of Batman. But when his adopted town of Blüdhaven is overrun with fleeing Gothamites, Dick Grayson realizes that he must return to Gotham City to help his mentor. In a story that features Superman, the Huntress, and the Darknight Detective himself, Nightwing must infiltrate Blackgate Prison and wrest control from the vicious criminals that have taken it over. But in searching for a new life, he may have only found his own death.