Aaronovitch, Ben: Rivers of London: Volume 08 - The Fey and the Furious

"Trouble never lies far from the race track. When a flash car belonging to a young boy racer from England washes up in the Netherlands with a bagload of unusual cargo, it's evident there is more than meets the eye happening at street races held in an Essex car park. Enter Detective Inspector Peter Grant. Fresh from suspension, he takes to the track in his orange 'asbo' Ford Focus to try and infiltrate the big leagues. But Peter soon finds himself sucked back into an Otherworld - a real-life fairyland!"--