The Time Traveler's Wife never appealed to me because of the title.  I don't usually care for science fiction and time traveling, but my friend recommended the novel and gave me a copy as a gift, so I tried it out.  Just as I expected, I didn't care for the time traveling.  I found the first thirty pages terribly confusing as dates and ages jumped around.  For me, The Time Traveler's Wife had a rough start, but it picked up after the first hundred pages or so once I figured out the time structure of the story, and it culminated with the final scene as the best scene in the book.The book tells the love story between Henry, a librarian plagued with a genetic disorder that causes him to involuntarily time travel, and his wife Clare.  The story and concept are unique, interesting, and captivating.  They touch upon a wide variety of philosophical topics, such as love, free will, age differences within relationships, sex, waiting for love, and genetic therapy.  It provides a lot of material for both self-reflection and discussion with others.Although I enjoyed reading the novel and became engrossed in the storyline, I also found many faults with the book.  My main complaint is that the characters were flat.  The story is told with the alternating perspectives of Henry and Clare, however, I oftentimes could not remember whose perspective I was reading.  The two characters are too similar and are poorly developed as separate individuals.  Henry is clearly the main character, and Clare simply waits for him throughout her entire life.  Some people might find her relentless waiting as a testament to her love for Henry, but I found it pathetic and irritating.  She has no personality beyond Henry.  Furthermore, I found Henry interesting because of his time traveling predicament, but he is not at all what I would envision of as a romantic hero in a love story.  The author sets up numerous situations in which she could have explored their deeper emotions, but instead she only skims the surface.  Similarly, the author sets up some great supporting characters, but fails to give them any depth.In the end, The Time Traveler's Wife is not a bad book, but it's not a great book either.  The story and concept were captivating, but unfortuantely, the characters were disappointing. 

Question: What is the main concept of books?
Answer: story and concept are unique , interesting , and captivating .