In 1986, when the Iron Curtain still seemed eternal, GDR youth aspires a cheap camping holiday at slightly more liberal Hungary's lake Balaton. Erfurt-base Streesemann family allows their teen daughters, sensible quiet Catrin and fresh Maja, to travel by thumb with home-made bikinis, warned never to forget about the StaSi, which posts attractive young agents. The sisters befriend fellow Germans Rudi Hartwig, as helpful as sensible, and the smitten couple Timo and Lilian, one of which is Western. By chance they meet and are charmed by the local luxury resort's slick but generous Hungarian manager Tamás Szabo, who bickers with jealous partner Zsófia over their secret. The apparently pervert lurker on the camping is actually the sisters mother's Western lover Erik Waller, who wants to get to know them, despite Kirstin, who panics when she gets win of it, ignoring her husband overheard her talking with a confident..