Desc: Summer Rebels: Directed by Martina Sakova. With Eliás Vyskocil, Pavel Nový, Liana Pavlíková, Kaya Marie Möller. Jonas(11) wants to visit his cool grandpa for a summer of fun on the river, but his mom has other plans. Undeterred, Jonas takes off on an adventure of his own in this tale of rebellion, friendship, catastrophe and, ultimately, redemption.