One small girl – one BIG adventure. When Max is sent to Istanbul to stay with her boring Great Aunt-Elodie, little does she expect to be plunged into a thrilling night-time adventure across Europe. And when the mysterious Heartbreak Diamond goes missing, Max must find her feet in a whirling world of would-be diamond smugglers, thieves and undercover detectives. Will she discover the real diamond thief before they reach their destination? Or does the answer lie closer to home…