I thought it was a pretty cool book, not a lot of the people on this forum shared that opinion with me, but I really enjoyed it. It is definitely a good read if you want to get a feel for how Ni works, because the main character is INFJ, and the things he does/sees things in the story are awesome examples of how they see the world with Ni. And yeah, there is an INTP character who is introduced into the storyline, and both him and the main character are essentially seeking natural law, only the INTP is taking the logical and science path, and the INFJ is taking the observational and spiritual path.