Detective deduces his own murder's location
Detective Erik Lönnrot reads three monthly killings on the 3rd as a Kabbalistic series spelling the four-letter Name of God, and maps the sites into a rhombus that fixes a fourth point: the villa Triste-le-Roy on March 3. The first death had been an accident, a botched jewel theft, and Commissioner Treviranus's plain robbery theory was correct. Criminal Red Scharlach, seeking revenge for his brother's arrest, read Lönnrot's theory in the newspapers and staged the later 'murders' to fit it, so the fourth victim was Lönnrot himself.