London, 1851. Joshua, a clever newspaper boy, dreams of having his own horse and a future as a royal messenger. But when he rescues an injured puppy from the Thames, he has no idea that this will change his life forever. Together with his friends and his loyal dog Hazel, Josh faces the shadows of London: a world of street gangs, villains, and hidden secrets. In a race against time, he chases thieves who have stolen the plans for a groundbreaking flying machine from a brilliant inventor – uncovering a conspiracy that reaches into the highest echelons of society. But this puts Josh and his friends in grave danger!.