A corpse is fished out of a north London canal with stab wounds through the eyes. The victim was a prominent member of the Hasidic Jewish community, and the cause of death one reserved by the Hasidim to punish "moysers" or informers.

When the father of privileged Rosina da Silva violently dies, she decides to pass herself off as a gentile and finds employment with a family in faraway Scotland. Soon she and the family father, Charles, start a passionate secret affair.