Once she has a dog! For that, Janne would even trade her little brother. Suddenly, Janne's biggest dream is within reach, as her friend is going away and is looking for a weekend home for the dachshund Trinchen. However, Janne's parents are against it. How unfair! Janne sees only one way out: she must secretly bring Trinchen home. But soon, the two of them find themselves in a hair-raising adventure with secret agents, nasty kidnappers, and mysterious neighbors. And when things get tough, it’s none other than Janne's annoying little brother Emil who proves to be a useful ally...