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 Great-Uncle Ismail had in mind for her? Join her, Aunt Sofia and her four friends Holly, Anna, Hermione and Jake on their journey.