The midsummer celebration at the campsite is abruptly interrupted when one of the summer guests is found murdered. Suspicion immediately falls on the aberrant mysterious young man. At the same time, Sebastian is called for questioning by the police's internal investigations.

Two young people find a car at the bottom of a limestone quarry. A dead woman is sitting in the car, and it soon turns out that the victim has studied at one of the island's folk high schools. Maria begins questioning students in search of more information.