While investigating the murder of a surfer in the waterfront community of Santa Marta, Lisbon reconnects with Greg Tayback, her former fiance whom she hasn't seen in over a decade. Greg owns a deep sea salvage company that used to employ the victim. While Lisbon combs the community for any enemies the surfer may have had, Jane investigates a local legend about sunken treasure that may hold the answer. Meanwhile, as Cho's relationship with Summer heats up, he starts to wonder if she can actually be trusted.