Harisha/Book 4: Marco Adams is an 8-year old boy. His parents Angela and Michael travel around the world and film documentaries about different cultures, tribes, animals. Their son accompanies them on their travels. Adventures follow him everywhere. Each story happens on a different place of the planet. With Marco, the young readers will travel around the world and see places like India, Kenya, Malaysia, Morocco, Jordan, Myanmar, Peru, and many others. They will meet maharajas, shamans, warriors, archeologists, explorers, different tribes and rare species of the animal world. They will discover the vast amount of magic, hidden in our seemingly well-known world. 'Harisha and Secret Circles' is the fourth book of the children's adventure series about the eight year old Marco Adams, who gets involved in all sorts of incredible situations while traveling with his parents around the world. This time the child finds himself at the archaeological excavations in Bulgaria, where he learns about a strange discovery depicting the same strange circles as the ones drawn on the mysterious card found in the palace of the Maharaja in Rajasthan. Will Harisha manage to decipher the secret message of those symbols and who will help him in this quest?