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 Peter learns more about basketball star DeMarcus Tillman, he uncovers evidence of athletes getting preferential treatment at St. Bernardine.

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.”

As Hitchcock and Scully microwave a lasagna for exactly 21 minutes and 30 seconds, the squad races against the clock to catch a hacker.

Kady goes to the flea market. What’s Zelda been up to? This one’s about Fen, you guys.