Batman: The Long Halloween Xtinction Agenda

The three men each made a vow. To women they pledged their lives. And then, to uphold those vows, they made an oath. To each other they promised to bend but not break the laws that bind. They did this for the greater good.
This is ultimately the story of how one man buckled under those twin imperatives, how one man shattered into two and how with both hands he brought the others down into misery with him.
"Our jobs don't include murder, Harvey."