In 1970, as Black Sabbath records their debut album, heralding the dawn of Heavy Metal, Hera Karlsdottir is born on the floor of a cowshed at her family’s farm in the Icelandic countryside. Her childhood is carefree until a tragic accident claims the life of her older brother, for which she holds herself responsible. In her sorrow, she finds comfort in the intense sounds of Heavy Metal and dreams of becoming a rock star. As time goes by, the farm remains blanketed in snow beneath a foreboding mountain, while Hera hones her guitar skills and fantasizes about starting a band. Now in her early twenties, Hera is a rebellious and misunderstood troublemaker who frequently finds herself in difficult situations. She longs to escape and explore the world, yet somehow always ends up back home. When her childhood friend returns with plans to marry her and a young priest arrives in the farming community, the course of her destiny begins to shift. Hera must mature, discover her own voice, and accept that she cannot spend her life running away.