In the quiet hours before dawn, two armed and methodical thieves entered the Renoir Museum in Cagnes-sur-Mer — the painter's final home — and removed four works before an alarm forced them to abandon half their haul and flee. Two paintings, valued at €9 million each, remain missing. The incident is not merely a crime against property; it is part of a widening pattern in which organized networks treat Europe's cultural heritage as a marketplace, and in which museums — built as houses of memory, not fortresses — find themselves increasingly outmatched.