"Oskar and the Secret of the Children's Gang" is the second time travel adventure of young Oskar, who returns to medieval Nuremberg six months after his first journey. There, he meets his friend, the talented painter Albrecht Dürer. The city is in turmoil as many lepers from the surrounding area arrive just before Easter, allowed to enter the city only during Holy Week. While strolling through the streets, Oskar and Albrecht discover a mysterious girl with a sack full of stolen goods. This raises the question of whether she is connected to the notorious thieves' gang, the "Guild of Beggars." This exciting adventure combines historical elements with a captivating plot and stimulates the imagination of young readers. The story is suitable for children aged 7 to 11 and offers not only entertainment but also insight into the history and culture of the Middle Ages.