A former janitor becomes a potential key witness, but Peter and Sam struggle to track him down. Meanwhile, they examine a student trip to Costa Rica.

Peter and Sam highlight Kevin McClain and his friendships as they start to break down the version of events supported by the school and police.

As Sam and Peter comb through digital clues, they hope a technology glitch might open up some new leads. But a low-tech discovery leaves them reeling.

Peter and Sam travel to a prestigious private high school in Bellevue, Washington, to document the story of a filthy vandal called the “Turd Burglar.”

Luke plans his next move with Kate, who’s having a rough day at school, and discovers VHS tapes that bring back emotional memories.

Luke tries to help Kate work through her feelings. Oliver and Luke hold film auditions. Emaline takes Kate shopping. Ken invites Luke over for dinner.