It's possible you're thinking of a specific book series, author, or genre, but without further information, it's impossible to know what you're referring to.
Could you please provide more context or details about what you're looking for? For example:
* Are you referring to a specific book series? If so, what's the title or the author's name?
* Are you looking for a specific type of book? Maybe you're thinking of a particular genre like fantasy, romance, or mystery?
* Did you hear this term somewhere? Can you provide more context about where you encountered it?
With more information, I can help you find what you're looking for.