Fullmetal Alchemist vol. 4

It was the cloest the brothers have ever come to the truth, but they were destined to leave it behind, escaping barely with their lives intact. With the evidence buried under a pile of rubble, only one thing us apparent: that evil is afoot within the ranks of the military, and that absolutely no one is to be trusted... not even themselves! In all this uncertainty, the brothers must once again learn to believe in each other... even as the military's darker side claims the life of one of their closest friends...