Based on his novel L'Écluse No 1. Maigret investigates a strange accident, noticing that the men of the Paris canals do not take well to interference.

Based on the novel Maigret Goes to School, the inspector travels to a seaside village near to La Rochelle to unravel a mystery involving many local characters, including the innkeeper, the postmistress and the schoolmaster.

Peter the Lett arrives in Paris with a reputation as the most successful confidence trickster in Europe. Inspector Maigret is waiting.