SUMMARY
Morgan le Fay has promised to make Jack and Annie masters of the tree house if they can solve four riddles. In the book Ghost Town at Sundown, the Magic Tree House whisks Jack and Annie back to a ghost town in the Wild West of the 1880s. The ghost town is in Rattlesnake Flats, Texas. There, they meet a mustang herder named Slim as they search for the answer to the second riddle. Jack and Annie helps him from rustlers.
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Out of the blue
my lonely voice
calls out to you
what am I?
The answer is Echo.
- They tried to save a mustang from rustlers.
- Slim's horse is Dusty