Lieutenant Thomas Glahn, a hunter and ex-military man, lives alone in a hut in the forest with his faithful dog, Aesop. Upon meeting Edvarda, the daughter of a merchant in a nearby town, they are both strongly attracted to each other, but neither understands the other's love.

Written in the form of a diary, Pan explores the wild beauty of the Norwegian landscape and delves into the shadowy alcoves of the human mind. It is a lyrical and disturbing portrait of love and the dark recesses of the human psyche.