Based on the novel of the same name by Shannon Pufahl. The character of Muriel (played in the film by Daisy Edgar-Jones) was inspired by Pufahl's grandmother and her experiences in the world of gambling in the 1950s.
The film has received criticism on social media for marketing and publicizing the film in a way which has frequently downplayed, and in some cases entirely erased, the queer love stories between Julius/Henry and Muriel/Sandra in the film. While Julius does have a connection with Muriel, it is platonic, and the majority of his character's story is actually focused on his relationship with Henry, the man he loves.