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The Secret of the Tarascan Ruins
In this third book in the Palo Alto Adventure series Carlos discovers the secret of the underground river with a dangerous trip inside the waterfall tunnel. Elena and Rafael's Great-aunt Elena tells them about a family secret that has been hidden for over 60 years and that would have further united Juanita's family with the Palmas, owners of the historical Hacienda Palo Alto. Gertrudes, the old family cook, tells them of her adventures during the Mexican Revolution, including facing a firing squad!
While the TV Company is filming them again "discovering" the treasure cavern, Leora, Juanita, Luisito, Pedro and Rafael make another discovery that shakes the archeological world.