After apocalyptic events claim the lives of his wife and son, and bring civilization to a standstill John retreats to an isolated mountain shelter in the remote Scottish highlands to live in austere survival. When his water supply becomes contaminated John must venture beyond his isolated retreat, and when he breaks into an abandoned farmhouse he discovers there are other survivors living there, a young couple about to have their first child. With supplies running low, in this bleak environment, the imminent arrival of the baby offers a glimmer of hope for the future, and an opportunity for John to reconnect himself with humanity.