Answer / Solution to the Inspector Beethoven III Puzzle
Strauss is the one who killed Handel.
You need to take turns assuming someone is the killer; that means everyone’s second sentence is a lie. If Joplin was the killer, Grieg’s lie mixed with Strauss’ counteracts the other. If Grieg was the killer, Gershwin would need to be a killer too. If Gershwin was the killer, Grieg and Strauss counter each other again, but with Strauss, everything would fit.—