Lontoo toisen maailmansodan aikaan. Kahden räiskyvän ja vapaamielisen naisen tiet kohtaavat kun selviää että karismaattinen runoilija Dylan Thomas rakastaa heitä molempia. Pohjautuu tositapahtumiin.

A teenager finds her perfect life upended when she's stalked by a mysterious doppelganger who has her eyes set on assuming her identity.

Patagonia narrates the journeys of two women - one looking for her past, the other for her future. The film inter-cuts between their stories, in which one of them travels south to north through the Welsh springtime and the other east to west through the Argentine autumn.