With King James on the throne of both England and Scotland, a period of stability seems to have arrived. But the exposed gunpowder plot to blow up Parliament serves only to heighten the anxiety and panic of the people. Nowhere is this more keenly felt than in London - a city that is also struggling to deal with its exploding population. In this metropolis of dreams and nightmares, trouble stirs. A well-known, elderly resident of Billiter Lane is missing, presumed dead, and when the corrupt local authorities attempt to frame an innocent woman, the task of discovering the truth falls to a trio of unlikely heroes/heroines. Led by the charismatic Mrs Cox, the three friends embark on a mission to bring the real culprit to justice. On their quest, they must learn to navigate the danger that lurks around every corner and manage to avoid the attentions of the crooked alderman Blincoe and his cronies.