Unexpectedly, Baroness Amalia Korff became... a murder suspect! But, returning from Paris to Nice, she simply could not pass by a man lying on the side of the road, shot three times in the chest... He turned out to be the owner of the Ivy cafe, Joseph Rochard. A few days later, his wife was also killed, and on the mirror there was an inscription in lipstick - “No. 3”... Inspector Henri Lemieux immediately believed that Amalia had nothing to do with it, and agreed to her help in the investigation. Together they found out: the roots of these crimes go back to the past, when the Rochards served in the Porcher castle. This is what the famous singer Lily Pons took to celebrate Christmas with her friends. There she found her death - allegedly committed suicide. But if everything is so, why did someone now start killing witnesses to that old case?