What roles did Baroness Amalia Korf, an employee of His Imperial Majesty’s special service, have to play! In a new case - about missing drawings containing a secret of national importance - she had to reincarnate as... however, this should remain a secret to everyone for now. Especially for a provincial police official with the sonorous name of Apollinarius Marcillac. It was he who discovered the body of a man who fell from a St. Petersburg train, but, alas, there were no drawings with him. Moreover, the next day the body itself disappeared! Marcillac would never have solved this puzzle if the incomparable Amalia had not taken up the matter...