Kristallklar tells the tale of a hidden river holding wild brown trout near the border of Luxembourg and Germany. Find out about this magical river from the perspective of Kirill, who recently acquired the lease to the fishing rights of the river and a small tributary thereof. It captures the essence of a fly fishing adventure on the river embarked on by the incredibly passionate Kirill and two companions: Nic, a fly fishing scientist and Simon, the filmmaker. The film tries to capture the feeling of the magnificent surroundings and being at peace on the river. It also delves into topics of conservation of nature and the plans to re-stock the river with native crayfish which vanished from the river. A lot of love went into this film the hope is that it inspires those around the world to find a love for the outdoors and to preserve it for many years to come and just to get out there and fly fish.