Books in Travel Time series

Four children from Crete, Alex, Irene, Kostantis and Nikolas, were searching desperately for their time-machine, which had mysteriously disappeared. That quest led them to strange places of many secrets. At last they found the machine, and this took them again to travels through time. During this adventure they met and befriended Alexander the Great. They understood his character, learned some of his secrets, and were transported with him in time to ancient Pergamon in the company of the philosopher Aristotle. A fascinating journey, full of new knowledge, danger and adventure.