An elderly man who managed to escape the extermination camps is secretly raising his two granddaughters, Ruth (16) and Naomi (15), deep in the Siberian woods. Due to his traumatic experience, the man has become obsessed with protecting his granddaughters from an ever-present Nazi threat. The three family members have been hiding out in abandoned hunting cabins, leaving one cabin every summer to seek shelter in another one. They are always on the run from the locals who killed their parents and are searching for them. From math and physics to literature and history, all the girls’ knowledge about the world comes from their grandfather’s notebooks.
One night the locals attack by surprise, forcing the sisters to leave their grandfather behind to an unknown fate. They must quickly flee to find a new cabin. Ruth, the self-appointed leader, follows every single one of her grandfather’s survival instructions to the letter, while the lively and curious Naomi seizes the opportunity to begin questioning the strict and seemingly arbitrary rules. A potentially explosive encounter with two young local men threatens to unravel their world and pushes the sisters to make a critical decision.