Early 20th century. Alternative England . At sixteen, Rosalyn Clifford’s life is arranged: she is the best student in a prestigious school, her father is the mayor of the city, she has many friends, and university studies are ahead of her. But everything changes a prophetic dream in which she sees a dead mother . Having learned the secret of her death, Rosalyn discovers the terrible truth - the slave trade, which her parents once fought, is still flourishing illegally in the country. With a bodyguard, John Rosie escapes to distant Lampshire to revive the underground Excalibur organization and end the brutal system forever. But the rich people of Lampshire are already on the trail of those who hinder them, and now all members of the organization will have to test their principles for strength.