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 and family.

But when the news reports a real theft at the petrol station, and some unknown tracks appear in the freshly laid dirt outside Riz's house, everyone gets involved to find out what happened.

What can the tracks tell them? And will they find out enough to catch the thief?