Henry Kostloff is stage manager and owner of a theater.He has come to the police station to announce that his young protege Arnold Kieler has disappeared.Henry Kostloff mentions also that the comedians used to exercise their voices in a stone-pit which looks like a classic theater.So the police goes with him to the stone-pit and there the police finds the corpse of Arnold Kieler who has been stabbed to death.
—zutterjp48