House of Margins is a 2026 novel by Tlotlo Tsamaase about a young African author, Anaya Sebeya, who disappears during a prestigious writing residency at a haunted colonial mansion, prompting her sister to investigate through a true-crime podcast. The book blends horror, magical realism, and social commentary, exploring themes of colonialism, racism, and the commodification of Black artists, using a mixed-media format that includes podcast transcripts.