The Ghost in the Tree HouseBook - 2016
A group of girls in Claire's town have noticed strange sights and sounds coming from the tree house where their club meets. Is it a rival boys' club trying to scare them away? Or is it a ghost? The girls ask Claire to tackle the mystery--and Kaz hopes to finally find the rest of his missing family members!
Publisher: New York New York : Grosset & Dunlap, an imprint of Penguin Random House, 
Copyright Date: ©2016
Characteristics: 128 pages : illustrations ; 20 cm