- Written by Gertrude Chandler Warner
- Narrated by Aimee Lilly
- Audiobook
- ISBN: 9781621881445
- 1 hour 48 minutes
- 7–12 years old
- Included in All Memberships
Tree House Mystery
Oasis Audio ● The Boxcar Children Mysteries
The Alden children are helping their neighbors build a tree house. From the tree house, the children discover they can see into the attic of the house next door . . . and they notice a window that not even their neighbors know about! Does the old house have a secret?
