This riveting alt history introduces dinosaurs into a pivotal moment in human history. Now the 1815 Battle of Waterloo is something other than a crushing defeat for the French emperor Napoléon Bonaparte, when he unleashes a terrible secret weapon - giant carnivorous survivors from pre-history - on his unsuspecting adversaries. In this world, smaller "saurs" are an everyday danger in the forests of Europe, and the Americas are a forbidden zone roamed by the largest and most deadly animals ever to walk the earth. But in his quest for power, Napoléon has found a way to turn these dinosaurs into nineteenth-century weapons of mass destruction. Only Willem, the teenage son of a court magician who lives near the battlefield, has the power to ruin the tyrant's plans. And Napoléon will stop at nothing to find him.