[Gutenberg 44059] • The Secret of Casa Grande / Mexican Mystery Stories #1

Down into Mexico, the land of cactus and mystery, go Jo Ann and Peggy to spend their vacation visiting a school chum, Florence Blackwell. The strange customs of the natives are a source of wonder and interest to the two girls.

One day Jo Ann notices that in the back wall there is a barred window which has no opening into any of the rooms in the ancient adobe house. She determines to learn where the window leads, but the ever-watchful Felipe hinders her exploration plans.

Taking no heed of the dangers of her adventure, Jo Ann climbs to the roof, and then finds that she is marooned there during the terrific midday heat.

Finally, the three girls manage an entrance into the secret room. The dangers they encounter there and the surprising discovery they make brings this mystery story to a thrilling and unexpected climax.