Now with new features! The green-black water glows mysteriously in the setting summer sun. The evening couldn't be more beautiful as Greta, Alex, and their daughter Smilla take the boat to the small island in the middle of the lake. Greta stays on the shore while the other two go off exploring. But they do not return. Worried, Greta sets out to search for them - but there is no trace of Alex and Smilla. In her growing despair, she turns to the police. It quickly becomes clear that Greta's own story raises just as many questions as the disappearance of her loved ones. And the question: Does she have something to do with it?.