Jørgen moves into Grandma's old houses along with MOM and dad. In the midst of moving the chaos it pops up a box with the endorsement "do not open". In the box there are thirteen letters, all addressed to Jørgen. Who has written the letters and what secrets hiding in the envelopes?
In pursuit of the enigmatic and unknown brevskriverne meets with Jørgen challenges he had not dreamed of. Fortunately, Jørgen best friend Mika. A friend he can share it all with.
It is allowed to have great expectations when the Mayor of the theatre goes into partnership with Trøndelag Teater, about theater and London Voices to make a spectacular family musicals with a lot of speed and fun. There is every reason to believe that a hundred secrets will be this fall's major highlight for everyone from 8 years and above