Devastated by the news of her husband's affair and convulsed by waves of grief and rage, twenty something Rose (Greta Gerwig)-vengeful, a bit unhinged, and still clad in her pajama bottoms-drives to a sleepy seaside town in Delaware intent on finding her spouse's lover. Climbing into an old lighthouse on the beach to swill a six-pack of beer, Rose stumbles upon a sleeping British teenager (Olly Alexander) whom she wakes and insists on taking somewhere.
The drama follows two brothers who start a bar and get swept up in its success in the midst of Belgium's nightlife scene.