An employee of His Majesty's special service, Baroness Amalia Korff, did not like working for other departments. But what can you do if the resident of Russian intelligence in France asked her for help? Amalia received a more than strange task: to see how the brilliant chemist Viscount de Botranchet died. No one had any doubts about the scientist’s imminent death in a duel at the hands of the British agent Colonel Worthington. However, the unexpected happened - Botranche killed the experienced warrior Worthington with one shot! An unexpected ending, but Amalia’s task is completed, and it would seem that we can forget about this strange matter, but it was not so. This unusual duel entailed many consequences - the baroness's partner disappeared, and she had to participate in his search, during which Amalia unexpectedly became very close to the brother of the murdered colonel...