London, 1802. -- On the miserable streets of the City's poorest slums, a single event gives eccentric Patrick O'Dair the chance to finally seize his lifelong dream - to come into wealth and riches. With the help of his two friends, Devon and Behan, Patrick invents a dangerous plan to impersonate a dead man's brother, which, if his disguise should slip even for a moment, would mean certain death for all three...