With the world under attack by deadly creatures who hunt by sound, a teen and her family seek refuge outside the city and encounter a mysterious cult.

Texas, 1969. Michael infuriates girlfriend Mary-Bob by accepting the draft to serve in Vietnam. But after a violent incident at boot camp, he deserts and escapes over the border to British Columbia. Here he finds shelter with a group of Russian pacifists, the Doukhobors. Meanwhile back in the US, Mary-Bob becomes a militant anti-war activist... Their stories are told through letters they are writing to each other but cannot send, because both are on the run.