Book one: The 13-Storey Treehouse
Book two: The 26-Storey Treehouse
Book three: The 39-Storey Treehouse
Book four: The 52-Storey Treehouse
Book five: The 65-Storey Treehouse
Book six: The 78-Storey Treehouse
Book seven: The 91-Storey Treehouse
There are 7 primary works and 9 total works in the Treehouse series.
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