• Written by best-selling Portugese author Regina Gonçalves.
　　• Best fiction titles for learning in Europe.
　　• Korean, Spanish, French, English and Simplied Chinese rights are sold.
　　• Selected as text books by Brazilian Ministry of Education, famous private schools and the Instituto Nacional de Matemtica Pura Aplicada.
　　• About one million copies are sold.　
　　• A historical fiction series dedicated to young readers and adults. It is packed with mystery and suspense stories that combine and integrate a wide range of fields of knowledge, such as History, Art, Philosophy and Science.
　　• English samples are available.

　　12 titles in this series: Mathematics–What beast is this?, Ramses II and the Battle of Kadesh, Napoleon Bonaparte in Russia, Alexander and Aristotle, The Phantom of the Opera Carmen, Einstein, Picasso, Agatha and Chaplin, Hannibal and Archimedes, Santos Dumont - Flying is for everyone, The Emperor and the Journalist, Tutankhamun,Marco Polo's Travels, The angel of the great depression

one more title in the second semester of 2023- "Enigma Machine in the Battle of the Atlantic"- is an adventure of Caius Zip during the second world war, with battle between a submarine and a destroyer warship, the search for the encoding/decoding machine called Enigma, the first electronic computer in Bletchey Park, dialogues with the math genius Alan Turing, Espionage and more...

　　Caius Zip is a teenager who, like so many others, is in conflict. His life seems doomed to boredom until the day that he disappears into thin air during a private maths class. Caius was chosen to travel in time for a very special reason. He must tackle mysteries, adventures, fun and, above all, confront his greatest fear – the monster of mathematics!
　　In order to do this, he must first learn to use his greatest ability, which he inadvertently uses very well: the power of deduction! In addition to the fun-packed chapters, this book has an educational approach and each story is interpreted according to important mathematical concepts, such as power, divisibility, prime numbers, highest common divisor, least common multiple, fractions, decimal numbers, periodic fractions, measurement units, percentages and first order equations.
　　This book is fictional literature, but it also provides support for teaching mathematics in a practical and playful manner. It is inserted in a constructive process that allows the reader to assimilate logical and mathematical reasoning. If you also think that mathematics is a seven-headed monster, an unsolvable enigma, then you cannot miss this adventure of Caius Zip against the beast of mathematics.

Regina Gonçalves
　　Regina has a degree in mathematics and systems analysis but decided not to pursue her profession in order to dedicate her time to teaching her daughters and other adolescents. She wrote textbooks with stories that combined the study of history with mathematics.
　　As these stories expanded, Regina found herself dedicating more and more of her time to writing and eventually completed a series of books about the young “Caius Zip – The Time Traveller,” for young readers and adults who are still young at heart.
　　Her works of fiction always aim at providing information and arousing the reader’s curiosity concerning matters of world history, art, philosophy and science. Mathematics has always been present in the solution of enigmas, and decision making in epic battles and during the investigation of a mystery.