I have recently read the second book in The 13th Reality series by James Dashner entitled, The Hunt for Dark Infinity. I thought it was a great book! It kept me on the edge of my seat with all the twists and turns the characters went on, and all the surprises it threw at me! One of my favorite characters is Sally. I thought Sally was one of the most entertaining folks I'd met in a long time.
The target audience of this book is youth/young adult, but I would heartily recommend this book to anybody.