Derbyshire officers deal with young and dangerous motorists, pursuing a 23-year-old wanted driver who is racing through busy streets at more than 90 miles an hour. While the officers follow at a safe distance, the suspect hurtles into traffic, causing a devastating four-car pile-up. Near Chesterfield, police race to a horrific crash, in which an 18-year-old's car has smashed head-on into a tree.