Now this may not have been Fringlourious Basterds, but it still had quite a bit of dark character work in it. It turns out that Walter's father was spying on the Nazis for the Allies, and while he was working with Nazi scientists he created a weapon that targeted specific character traits of human beings. Much of the episode consists of the team seeking out the books that Walter's father kept much of his work in, which Peter sold during his fit of rage after Walter was condemned to a life at a mental institution. Walter is takes this specific case especially personal given the circumstances, and that pushes him to do such an extreme move as murder.
Ultimately it was another drama filled, quick paced hour that mainly focused on Peter and Walter, which left Olivia once again taking the back seat. This season you could almost forget that she's the one who brought the group together in the first place. However the next episode promises a healthy dose of heroism from Dunham, as well as a reveal about the "abilities" that she was given by William Bell. My grade for this episode is 8.0 out of 10.