During Sandra Panitch's trial, Gus and Shawn investigate the murder she allegedly committed.
Shawn scrambles to cover for Gus when he inadvertently corrupts a crime scene and makes himself the prime suspect.
The killer: Tom, a high school student; the victim: Glen Martin, a popular singing science teacher at Tom's high school.
Tom, a quiet student, enjoys being invisible so that he can engage in his favorite activity of creeping; breaking into people's homes just for the fun of it.
While Olivia and a recently-recovered Peter investigate a mysterious signal coming from a forest, Walter uses LSD to try and recall his memories of his plan to defeat the Observers.
When Erica and Ethan start arguing a lot in their relationship, Erica notices, that she doesn't even know why. When meeting Doctor Tom for her therapy, he sends her back to an early relationship in summer camp, that suddenly, without her knowing why, ended and resulted in her getting thrown out of camp.moreless