K3 arrive in their new flat. They discover that a lot of boxes from the previous owners have been left behind. They find a welcome letter in the first box and all boxes appear to contain items and memories from the rich history of K3.
Marthe, Hanne and Klaasje are still unpacking boxes. The girl share their favorite moments with the viewers. But the girls discover a mysterious box and it soon becomes apparent that you should always be careful with things from the past .
Hanne, Marthe and Klaasje find a beautiful piano under a large canvas. They discover and unknown talent of Klaasje. In a box full of photos they notice that K3 has already visited a lot of places.