Gas masks... on! Olivia knows to carry one at almost all times when investigating various scenes on Fringe.
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This is your basic Fringe scene. Walter, Olivia and Peter try to get to the bottom of a case.
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Peter Bishop is on the scene in this photo. It's courtesy of the episode "The Bishop Revival."
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Walter and Peter survey the scene during this photo from "The Bishop Revival." It's the 1/28/10 episode of Fringe.
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Walter has extra motivation to get to the bottom of the case on "The Bishop Revival." That's because a few deaths may be liked to his former experiments.
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Walter finds himself more invested than ever in the deaths at a wedding in the episode "The Bishop Revival." They may be connected to an old experiment.
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Fringe Season 2 Episode 13 Quotes

Walter: That man corrupted. He corrupted my fathers work.
Dunham: I understand.
Walter: No, no, it was more than that. You see, family is very important to me. There's nothing I wouldn't do.

Perhaps there are some mysteries that are destined to remain unsolved.

Walter