It's about Leon Vitali, the actor who played Lord Bullingdon (the neurotic brother of Lady Lyndon) in Barry Lyndon. After filming Barry Lyndon, he quit acting and became Kubricks personal assistant / factotum for over 20 years. Although some would say he was Kubrick's personal slave. It is utterly shocking to see how badly Kubrick treated him at times. Vitali did the work of 4-5 assistants, completely neglected his family, destroyed his health, spend the best years of his life re-cutting scenes until 5 in the morning while listening to Kubrick's violent tantrums, and ended his successful acting career for him. But apparently he was paid so little by Kubrick that he ran into financial trouble after the director's death. Yet for some mysterious reason, he remained completely loyal to his master until his own death in 2022.