Stones and Bones (co-authored with Branca Fabrício). São Paulo: Ática, 1994.
This book is part of a 12-volume series of readers (Buddies) for secondary schools in Brazil. The stories revolve around the adventures of a group of friends from childhood into their teenage years, and they deal with relevant issues for that age group such as friendship, concerns about the future, changes in their bodies, leisure and relationships.
In Stones and Bones, seven children and a dog inadvertently turn on a time machine and end up travelling to prehistory. In their new space (and time) the kids have to persuade the cave people that they are not their enemies. In fact, the kids even have the chance to – maybe – change the course of history!