9th&up. Wow. This book was good, but pretty depressing! Kind of "The Village"-ish. It starts with a small closed society, a fragile bubble surrounded by the chaos and pain of reality (in this case, zombies!), with a hierarchy and social structure that holds onto order with an iron fist and a heavy does of fear and intimidation for anyone who questions the way of things. 
 The heroine is a bit selfish in my opinion, she reminded me of Katniss from The Hunger Games (and there are a couple of characters that have Peeta-esqe qualities as well.) 
 While Forest ultimately offers a bit of hope for the future, it is a sort of feeble light almost extinguished by pain and loss and missed opportunities for love and meaningful connection. It leaves you with the question of whether dreams and hopes are worth pursuing at all, because what you sacrifice along the way might turn out to be infinitely more valuable than the realization of the dream that you held onto for so long.