On the last sailing trip of the year, Sabine's son Kjell goes overboard. Despite an intensive search, he is not found, neither dead nor alive. Sabine desperately struggles against her own fear and panic.

Cecile overhears a conversation that shakes her and sends her on a mental downturn that picks up speed when Kjell disappears into the sea.

Bernd's hunt for the truth helps him deal with the pain of losing Kjell, but it also threatens to put everything else in his life at stake.

The aftermath of the tragedy affects all family members, in both families. When adult support crumbles around, the young have to cope alone and take care of each other.

Certain the Kjell is still alive, Karl hangs up lights everywhere to help lead him home. He makes a surprising discovery that helps cement his theory.

Charlie faces a decision that could literally mean the difference between life and death, and has to face the fact that she can not handle everything alone.

Kjell's experience on the night he fell overboard is revealed, as Jonas appears with a piece of the puzzle.