Batman Vol. 3 #121 (Online Order Only)

The deadly conclusion to the "Abyss" arc as Lex Luthor s dangerous master plan for Batman Inc. is revealed. And an old ally returns to pull the lost Batman out of Abyss s darkness and a new member of Batman Inc. rises! In the final chapter of "They Make Great Pets," Maps finds the missing piece to the shocking and deadly mystery...with a little help from Batman!