In the closing years of the 20th century the British Empire's rule is still going strong. Queen Victoria is about to celebrate her 160th birthday, kept alive by advanced steam technology. London is a fantastical sprawling metropolis where dirigibles roam the skies, robot bobbies enforce the law and dinosaurs are on display in London zoo. Welcome to Magna Britannia, a steam driven world full of fantastical creations and shady villains. Here dashing dandies and mustachioed villains battle for supremacy while below the city strange things stir in the flooded tunnels of the old London Underground. In two scant months the nation, and all her colonies, will celebrate 160 years of Queen Victoria's glorious reign. But all is not well at the heart of the empire of Magna Britannia. A chain of events is about to be set in motion that, if not stopped, could lead to a world-shattering conclusion. It begins with a break-in at the Natural History Museum. A night watchman is murdered. An eminent Professor of Evolutionary Biology goes missing. Then a catastrophic overground rail-crash unleashes the dinosaurs of London Zoo.