13-year-old Jonja goes on a summer holiday with the open and wealthy family of her best friend Paul. A completely new world for Jonja, who usually lives with her family in a small prefabricated apartment. In the holiday home by the lake, the friends spend two days full of ease and freedom. Jonja discovers her interest in Paul's older brother and maybe even a little more in his summer flirt Melanie. But the summer idyll is based on a lie that won't last long and will endanger everything.