Matt Thompson is in trouble again. A rare old book about legendary track star Alfie Shrubb has gone missing from the local museum, and all fingers point to Matt. To make matters worse, his new running club won't be running in the annual race named after Shrubb, but is instead volunteering. With help of his friends and a former Olympic runner with serious challenges of his own, Matt tries to clear his name. He also learns again what it means to be a runner in this follow up to "Mud Run" and "Mud Happens."