The House of Daniel is an urban fantasy novel released from Tor on April 18, 2016. It is set during the Great Depression in a United States where magic works. The story's central protagonist and narrator, Jack Spivey, recounts his time with a barnstorming baseball team called the House of Daniel. Despite the presence of working magic, Turtledove describes the novel as an urban fantasy only, and has explicitly rejected it as alternate history.
The Case of the Toxic Spell Dump, "Birdwitching," and The House of Daniel are all set in worlds where magic works and supernatural elements are common. However, the three timelines have very different rules of inner logic regarding biology, theology, and other crucial matters.