Broken chain

Oskar Rosen was born at the end of the Second World War in Bohemia, but he lived in France for seventy years. When he now learns from the notary that he inherits a house and other real estate in Prague from his previously unknown aunt Vilemína Pokorná, he decides to fly in, to find out what his roots actually are, and hires a private investigator, who speaks French, to help him with his search. One day, the detective gets a text from Rosen saying he needs him urgently. But when she arrives at his apartment, she finds Rosen dying. Obviously, it was a homicide. All we can do is call Major Hackenschmied from Homicide.