Abby Pruitt and her brothers, Philip and Sam, discover an abandoned zoo in the woods. A zoo where the dead find no rest and myth and magic mingle with the real world. The Pruitt children are drawn to the forgotten zoo of Forest Heights that is host to the undead animals and people that died there so long ago. An ancient curse holds them all to this place. They make friends among the undead at the zoo, and they discover that old grudges and mysteries linger long after death. Disarray and upheaval quickly follow the children to the abandoned zoo and things go horribly wrong before the curse is broken. From summer vacation to the snow days of Christmas Philip, Sam, and Abby do their best to help their undead friends at the zoo...even if it means letting them go forever.