London, XIX century. Mysterious incidents are the jurisdiction of the secret Ministry, which manages to bring out of the shadows... its best agent! For Eliza D. Brown, who has chases, shootouts and explosions in her blood, transferring to the Archive, under the leadership of the modest and indecisive Books, is like death. But the clever Wellington Books will take her side! Finally, the evil genius Dr. Havelock will have a worthy opponent. The partners cannot sit down with paperwork when mutilated corpses are found on the Thames embankment, and the activities of one secret society pose a threat to all of England. But their enemy has a mechanical army at their disposal, and open confrontation will doom the mission to failure. Will Mr. and Mrs. St. John, under whose mask Eliza and Wellington are hiding, manage to steal and destroy the drawings of the universal soldiers?