Winterlong (2018)

When his estranged teenage son is left unexpectedly on the doorstep of his caravan, Francis, a lawless, feral man who lives on the margins of society, is forced into an impossible relationship with the boy. As they wander the Sussex hinterlands trying to figure out how to make it work between them, disaster looms when Julian breaks a promise and they fall under the spotlight of the police. But will salvation come in the form of an alluring friend?