Terje Klevjer finds the camping equipment of fruit merchant William Anker Lie, at Trytetjern in Nesbyen in July 1972. But both Anker Lie and his car have sunk into the ground. The police's old investigation documents put Asbjørn and Kristian on the trail of where they should start their search. And who steals aircraft engines from Norwegian airports?

In recent weeks, Kristian and Asbjørn have been looking for traces of fruit and vegetable trader William Anker Lie. The investigations have led them to the mountain lake Trytetjern near Nesbyen. Here the sonar detects an object at a depth of ten meters - only 150 meters from the place where he was last seen - and divers must be called.