Directed by acclaimed Swedish filmmaker Göran Hugo Olsson, That Summer centres on the film project artist by Peter Beard, initiated along with American socialite and former princess Lee Radziwill about her relatives, the Beales of Grey Gardens. 
 
Lost for decades, Beard’s extraordinary footage re-emerges in this documentary, focusing on Beard’s intimate family of friends and their vibrant creative community in Montauk (Long Island) in the 1970s. Featured characters include Peter Beard, Lee Radziwill, Edith Ewing Bouvier Beale, Edith Bouvier Beale and Andy Warhol.