The story of Jarda Kuchař, a hero of the bygone era of Tuzex vouchers. His income comes from renting out his own apartment. Every summer, he is forced to spend his time at an abandoned pond, where he runs an even more abandoned snack bar. His right-hand man (and he is left-handed) is the local simpleton Kamil Hošpes. Among the handful of customers are two tractor drivers, Jirka and Péťa, and Jarda's sworn enemy, the fanatical fisherman Pepa Vrtílek with his dog Pepík. The capricious summer days are disrupted by an apparition of monstrous proportions. Lojza, a monster catfish, emerges from the depths of the third irrigation category and eats Vrtílek's dog. Jarda Kuchař sees Lojza as an opportunity to revive local tourism. He calls on fishermen from all over the country. And two actually arrive...