Its definitely a must-read book to what I believe teens 13 and above. Absolutely a 'cliffhanger' and always keeps you on the edge of your seat. Having read the first novel "miss peregrines home for peculiar children", I had braced myself for what to expect in "Hollow City". Absolutely outstanding! You'll be kidding yourself if you turn down a book like this one :)) the writing style is highly expectable, enabling teens to relate to the characters, mentally. The author creates diversity and drama and believe me, after reading the first chapter, you won't want to put the book down!