A new case for the detective duo! On your marks, get set, go: The first one to cross the finish line in the main square of Valleby wins a gold medal and 10,000 kronor. All participants appear confident of victory before the race and seem willing to do whatever it takes to reach the finish line first. But should one really use any means necessary to win? When it comes to the grand finale, the police chief can't keep up with the pace of the cyclists and doesn't know to whom he should award the grand prize. Luckily, Lasse and Maja are on the scene.