Walk on Water.

Eyal, an Israeli Mossad agent, is given the mission to track down and kill the very old Alfred Himmelman, an ex-Nazi officer, who might still be alive. Pretending to be a tourist guide, he befriends his grandson Axel, in Israel to visit his sister Pia. The two men set out on a tour of the country, during which Axel challenges Eyal's values.