A mysterious bigfoot-like footprint found near a crime scene puzzles the CSI team as they work to uncover who – or what – killed a father and son.

Daisy plans a walkout, but struggles to get all the Bayside kids to agree. Mac confronts his dad.

Johnny sets out to complete his father’s work; Lana leads the charge to finally shut down Briarcliff.

In Montenegro, Bob has a moral dilemma when he disagrees with the team’s mission. Tiffy discovers some information about Molly’s past and decides to look into it further.