This is a steampunk novel set in 1848. Revolutionaries have tried to overthrow monarchies in countries all across Europe. In Britain, the Chartists demanded the right to vote. They claimed their mass rallies were peaceable, but the Government feared the worst. The new police force cannot cope. The Government called out the army and put the aged Duke of Welington in charge. Agitators within the Chartist movement conspired to subvert their rallies to their own ends.
In London, the Chatelaine of the Guild of Magicians has died in mysterious circumstances. Her niece Samantha is told that she must leave school and inherit her aunt's role. Her duties are mainly honorary. But, as the male leaders of the Guild bicker, she is able to arbitrate between them.
Nervous politicians want the Guild to protect them. Samantha hopes to use her limited authority in an attempt to thwart the reactionaries. But she suspects that her predecessor was murdered. Those around her fear that she is the next target.