What happened in this volume is less clear than the rest of the series thus far. And the sudden turn of Roy Mustang to evil, then obviously turning him back to good is I think the center point of this volume. I feel it's a bit clumsy, although it could be a bit more powerful, the whole story with Maria Ross.

Ed, Al and Winry finding out about Hughes is heartbreaking, though, and that's well played on the author's part.