The forces of good and evil that Lynch had limited to a small town four years earlier with Blue Velvet are blown out into the larger expanse of the American road. That uneasiness is the lifeblood of Wild at Heart, which sets a love of the purest and most passionate kind against a sun-scorched landscape of ceaseless hostility. The appeal of road movies is that they allow for a certain amount of narrative spontaneity, with every exit teasing the possibility of a new and unexpected subplot. The sequence is Wild at Heart in microcosm, with the AM stations representing treacherous pitstops on the lost highways between a deep south correctional facility and sunny California, where Sailor and Lula hope to carve out some place for themselves. Romance pokes through the violence and discord like a bloom through cracks in the pavement. And then suddenly, the adrenalized thump of Powermad’s Slaughterhouse fades out and the lush strings of Richard Strauss overwhelm the soundtrack. As the two thrash along in the embankment – Sailor, with his karate-kick dancing style, seems like a terror in nightclubs – Lynch’s camera cranes upwards to a magic-hour sunset across the field.

“Sailor Ripley, you get me some music on that radio this instant!” she screams, and he obliges, scanning past more talk-radio mayhem before landing, improbably, on a track by the Minneapolis speed metal band Powermad.

Book called wild at heart