No spoilers, please! Quentin Tarantino is pleading with Cannes Film Festival goers to avoid spoiling his new film, "Once Upon a Time in Hollywood."

A day before the movie premieres at Cannes, the director posted an open letter on Twitter and Instagram asking audience members to avoid "revealing anything that would prevent later audiences from experiencing the film in the same way."

The movie stars Leonardo DiCaprio, Brad Pitt, Margot Robbie, and Al Pacino. Much like "Pulp Fiction," "Once Upon a Time in Hollywood" weaves together a tapestry of stories. It's set in Los Angeles during the summer of 1969, when Charles Manson and his devotees murdered actress Sharon Tate (Robbie) and others.

DiCaprio plays the washed-up star of a Western TV series who's trying to carve out a new niche for himself in the industry, while Pitt plays his friend and stunt double. And they have famous next-door neighbors: Sharon and director Roman Polanski.

Everyone who isn't at Cannes will have to wait until the movie opens in theaters, July 26.