Volume four of Fullmetal Alchemist continues this brilliant series and gives some back-story on the world where the show is set and the quest for the Philosophers Stone. The volume kicks off with episode thirteen which has Ed duel his superior, the Flame Alchemist, Mustang to force him into giving up information on a lead. Although mainly something of a comic relief episode it is still good fun and well made.
Episodes fourteen and fifteen sees the brother's track down Doctor Marcoh whom they believe knows something about the Stone. Things don't go as the brother's plan when the Doctor is captured by the military only to escape when the scared stranger attacks and kills his escort. These two episodes are quite dark and give details of why the scared man hates alchemists and what can happen if the Philosophers stone falls into the wrong hands.
Finally in the final episode Ed and Al are returning home for repairs but a mix-up on the train leads to Al being stolen. Overall this volume is the best yet and although the series habit of going from slapstick comedy to some rather dark scenes of war and massacres can possibly be jarring to some people, I feel it suits the series perfectly.