One Deadly Summer (French: L'Été meurtrier) is a French film directed by Jean Becker. Isabelle Adjani won a César award for her performance in this film. The film was a massive hit in France gaining 5,137,040 admissions and was the 2nd highest grossing film of the year. The film is based on a 1977 novel by Sébastien Japrisot (whose real name is Jean-Baptiste Rossi).