What roles could Baroness Amalia Korff, an employee of the special service of His Imperial Majesty, have to play! In a new case—about missing blueprints containing a secret of state importance—she had to reinvent herself… though for now it must remain a secret for everyone. Especially for the provincial police official with the resounding name Apollinariy Marsilyak. It was he who discovered the body of a man who had fallen out of a Petersburg train, but, alas, no blueprints were found with him. What’s more, the next day the body itself disappeared! Marsilyak could never have solved this riddle if the incomparable Amalia hadn’t taken the case…