In 2006, she wrote the best-seller, "I Am a Taxi", which tells the story of a Bolivian boy named Diego whose family was accused of smuggling coca paste, which is used to produce cocaine. After an accident causes Diego's family to owe money to the prison in which they are incarcerated in, the boy must earn them money. He ends up in the coca "pits" where the coca leaves are made into coca paste, and the story follows his adventures from there. The sequel, "Sacred Leaf", is about Diego's time with the Ricardos (a family who helped Diego) and a giant coca leaf protest.