This is a documentary in which three men travel across Europe together, but they’re not pleasurably interrailing, even though there are often times they probably wished they were. For two of them, Niklas and Horst, the journey is about confronting their fathers, who were high-ranking Nazi officials responsible for the deaths of millions of Jews, while for the third, the eminent British human-rights lawyer Philippe Sands, it means visiting the place where his grandfather’s family was exterminated.