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Zack's mother died but his father married a woman named Judy that Zack is very close with.
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The story takes place at Pettimore Middle School, New York.
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Horace Pettimore is trying to come back from the dead using a student's body and going to kill the whole school with his zombie.
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Zack- a twelve year old boy who can see ghosts
Judy- Zack's step-mother who is very close to Zack and can also see ghosts
Malik- Zack's friend
Horace Pettimore- A ghost who is trying to take his descendent's body
Azalea- Zack's friend, Horace Pettimore's descendent
Ms.Dubois- Zack's history teacher who is pretending to be friends with Zack.
Eddie- Ms.Dubois's brother, helping her get Pettimore's treasure
Wade Muggins- The school janitor who was turned into a zombie -
At the Open house Zack meets the Donelly brothers who are ghosts and want him to join them.
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On the first day of school Zack bumps into the school bully who already hates him for beating up his little brother.
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On the bus Zack meets a boy named Malik who the school bully also hates.
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Zack and Malik find a headstone with a secret code on it. They take a rubbing of it and leave
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Zack tells Azalea that he can see ghosts and she tells Ms.Dubois.
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Horace Pettimore learns that the child who's body he can steal is Azalea not Zack. The reader learns Ms.Dubois has been faking being friends with Zack.
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Zack and Malik decode the writing on the gravestone. The gravestone says there is treasure guarded by a zombie.
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Ms.Dubois calls Eddie and talks about how to get the treasure.
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Ms.Dubois reads the letter written by Mr.Cooper saying that he could talk to ghosts through Seth Donelly and how he killed the Donnelly brothers.
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Zack is warned about Eddie and Ms.Dubois by Davy Wilcox, Zack's guardian ghost.
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Pettimore takes Azalea's body. Zack must confront Pettimore and save Azalea.
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Zack frees Azalea from Pettimore and gets Pettimore's treasure.