The puzzle (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. 

The puzzle is a story about seven children and a dog who, moved by curiosity, find out that a river near a campsite where they are spending some time is being polluted with toxic chemicals or poison that is being dumped from a nearby cave.

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