Trying to find a book title: story is about a nazi who runs a camp, knows the war is over, so transforms himself into a jew, ends up high up in the Isreali army, married with kids, when the nazis in exile contact him. His son realizes his father is a war criminal from a habit he has of touching his face or something, and then the father/ex-nazi ends up jumping on a grenade at the end of the story to save his son from death.
