A Million Little Pieces has genre Speculative fiction
[Human]: Do you know who wrote A Million Little Pieces? [Assistant]: It was written by James Frey. Do you enjoy speculative fiction? [Human]: Oh, okay and not really I enjoy fantasy and horror fiction. Are there any writers that you could recommend for those genres? [Assistant]: You might enjoy Wizard's First Rule then. It could be considered a fantasy.  [Human]: Who is the author for Wizard's First Rule? 
Unfortunately I don't have access to that information. There is another book called the Wolf Brother that you might like.