Riz Chester loves mysteries, and with an interest in forensics she keeps finding crime. But nothing has happened for months. With Riz and her friends itching for a mystery to solve, Riz organises the perfect forensic party for her friends. Even her brother, Pax, is joining and Mum and Dad are helping.<br/><br/>But when the news reports a real theft at the petrol station, and some unknown tracks are in the freshly laid dirt outside Riz's house, everyone gets involved to find out what happened.<br/><br/>What can the tracks tell them? And will they find out enough to catch the thief?