• 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, the time traveller, appears on the coast of Cartago during a shipwreck. Caius is impressed by the advancements of that splendid civilization. The great general, Hannibal, is fighting the Romans and Caius is sent by a quinquerreme warship with his new friends to help Hannibal in Italy. Caius will listen to Hannibal´s stories of battles and realize that he is a true genius in the planning of war.
　　Before the battle of Cannae, Caius plays Epyskiros, a dangerous ancestor of our football, and falls in love with a beautiful Celtiberian warrior. In Cannae, 　　Caius learns that war is, in fact, a monstrosity when he loses friends and witnesses a scene from hell of 80 thousand fallen soldiers in a matter of hours.
　　Then, Hannibal sends Caius to Syracuse to help Archimedes with his great inventions. Sent to Alexandria to rescue Archimedes, Eratosthenes, the librarian of Alexandria, and Apollonius, the great geometrician, are unfortunately too late. Archimedes leaves the apparently unsolvable enigma for the two men to figure out, but it is solved with the help of Caius.
　　Eratosthenes and Apollonius take Caius to Alexandria where he meets a delegation of wise men who have fled from China, under the rule of emperor Qin Shi Huang, and watches, perplexed, an exhibition of the fantastic planetarium designed by Archimedes. A fascinating journey to the great ancient civilizations.

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.