Il fiume sotterraneo

In the canyon of the lost ship, the pards defend themselves from the poisoned darts of the Pimas and from the dynamite of the shady Velarde, who dies at the hands of one of his Indians. The rangers and Professor Doberado, tracked down on behalf of El Morisco, face the Chinese of the secret valley and the roaring waters of an underground river! Some time later, Nat Mac Kennet summons Tex to New Orleans: the mad Pierre de la Rochelle, a maniac for independence, has escaped from the mental hospital. And in the swamps, alligators started eating more people than usual!