Summer reading for 9-year-olds about friendship and holidays. Fili goes on vacation with dad during the summer holidays - to a campsite with a swimming lake. Not exactly Ibiza, Fili thinks. But she doesn't let that get her down. At least in the photos she sends to her best friends, it should look like a great beach holiday. Fortunately, the brothers Otto and Jayson help her with this. But then more and more things disappear in the area and the three have to solve the case. Completely catastrophic!