When Kactus, Luna, Tatiana and Eco decide to form a gang called the Epimilondilos, they can’t begin to image the disturbing series of events that awaits them. The Epimilondilos find a meeting place and also discover that something strange is going on at school. Mr. Dimas, their teacher, is acting peculiar, and they can’t figure out why. They also have no way of knowing that five wizards and witch doctors, known as the Invisibles, have come together from five different continents to carry out a sinister plan contrived by Afibius, an evil creature from the depths of the sea, to take control of the planet. Nor do they have any idea that Afibius’s plan involves them. The Epimilondilos live outrageous adventures and terrifying moments, witness inexplicable events and surprise attacks, all because of the Invisibles.