An old mansion with cobwebbed rooms, creaking stairs, flickering lights in the night, secret basements, footprints in the garden, and a hooting owl can only hide some terrible secret. What could it be? Alexis, Katerina, Yiannis, Lawrence, and Michael do everything to discover it. Will they succeed? But beyond the mystery, this book has other wonderful things, as it narrates what happens in the romantic setting of Kifisia. The three books, "The Enigma of the Tower," "The Contract of the Tower," and "The Prisoner of the Tower," form a trilogy that solves the mystery of the tower. [Excerpt from the text on the back cover of the edition]