"The Vanishing of Sidney Hall" is a drama film that follows the life of a young writer named Sidney Hall, who gains fame after publishing a novel based on his high school experiences. However, as his success grows, he struggles with personal issues, including relationships and the pressures of fame, leading to his eventual disappearance. The story unfolds through flashbacks, revealing the impact of Sidney Hall's life on those around him, including his friends and family. The film explores themes of identity, loss, and the consequences of artistic ambition, ultimately questioning the nature of success and the price one pays for it.