* A working title: The book might be in the process of being written or published and hasn't been officially released yet.
* A self-published or little-known work: It might be available online or through less mainstream channels.
* A misremembered title: The actual title might be slightly different.
* Fictional: The book might not exist.
If you can provide more details, such as the author's name, genre, or where you heard about the book, I might be able to help you find it.