"Mystery of the Two Tree Houses"
is the next book in The Panther Creek Mountain series.
The kids build two tree houses in separate trees and connect them with a rope walkway, high off the ground and over a creek!
One day they find some mysterious objects in their tree houses! Who has left these things in their tree houses? Are the objects from a friend or a foe?
They do some detective work and discover that an old mountain Hermit lives in the hills above their Treehouses. Is he the one leaving little gifts for them? Is he trying to lure them with the gifts?
There are so spooky things to be discovered.