For the first half of the book, the story seems assembled more than written, like a paint-by-numbers kit. Mean ghosts appearing and disappearing, a graveyard, spooky trees, small-town secrets, short sentences, and short chapters with cliffhanger endings -- yup, the gang's all here, though a bit better written than R. L. Stine. Still, it does make one wonder why so many horror writers can't seem to come up with anything new.
In the second half the author does come up with something relatively new, and a lot more interesting: a complex mystery behind all the supernatural deja-vu. Alert young readers will see the surprise twist coming almost from the beginning, but they may not anticipate the positive effect all this trafficking with ghosts has on Zack's character, which, along with a refreshingly loving stepmother-stepson relationship, makes for a more than usually satisfying ending.