The Decoders in the Magic Sapphire — Alba Arango

Steve, Matt, and Jenny always dreamed of being detectives. One day, the twelve-year-olds' dream becomes reality when they discover an ancient treasure map written by a pirate named Elias Darby over three hundred years ago. According to legend, the pirate hid a magical stone with only a poem titled “El Alma de Dios” as the key to locating it. As the trio happily begins the search for the treasure, they unknowingly attract the attention of an international jewel thief named Frank Alexander and his two rather large henchmen. As the investigation leads the three friends to a string of hidden caves filled with booby-traps, they are confronted by the jewel thief who comes up with his own plan to force the kids to find the stone and give it to him. The detectives must brave the dangerous traps to discover the hidden treasure while at the same time try to figure out how to out-smart the jewel thief.