Crime Scene Canal du Midi - Monsieur Keller investigates where others go on vacation. Retired chief inspector Konrad Keller has relocated to France after the death of his beloved wife. There, he travels along the rivers and canals on his houseboat Bonheur. His first destination: the southern French city of Carcassonne with its famous medieval fortress. Keller is enjoying a relaxed evening on deck when suddenly a young man bursts onto the houseboat - pursued by the police. Allegedly, the convicted junkie has brutally murdered a mother and her two teenage children. The suspect can be subdued, but the experienced inspector quickly suspects that his colleagues are chasing the wrong person and begins to investigate. Houseboat Mysteries 1.