Maigret had questioned thousands, tens of thousands of people in the course of his career, some occupying important positions, others who were more famous for their wealth, and others still who were considered the most intelligent of international criminals. Yet he attached an importance to this interrogation he had attached to no previous interrogation, and it wasn't Gouin's social position that overawed him, or his worldwide fame. Maigret's fascination with a charismatic brain surgeon nearly blinds him to the truth at the heart of a case involving a mysterious young woman in a luxury Paris apartment block.