Architecture student, Sibel Karaman, receives a letter from Great-Uncle Ismail on the day of his death. He leaves her a mystery to solve which takes her and Aunt Sofia on a wonderful adventure to three beautiful cities: London, Venice and Istanbul. Can Sibel solve the mystery of the three domes and find the very special place that Uncle Ismail had in mind for her? Join her, Aunt Sibel and her four friends Holly, Anna, Hermione and Jake on their journey.