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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.
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.
An interview with a former St. Bernardine student gives the guys confidence that they're on the right track with their most recent theory.
In the wake of their first documentary's success, Peter and Sam seek a new case and settle on a stomach-churning mystery at a Washington high school.