On doctor’s orders, Maigret is taking a rest cure in the elegant spa town of Vichy, known for its mineral waters and serene routine. He spends his days walking, sitting on benches, and taking the waters — reluctantly relaxing.

While there, he notices a quiet, graceful woman named Hélène Lange who follows the same daily schedule as him. They exchange nods, but never speak.

Then — she is found dead, strangled in her hotel room.