Tom Downey goes in search of the French capital’s landmarks – as patrolled by Georges Simenon’s French detective ‘Maigret’s process meant poking around. He’d stroll the canals with a lit pipe in hand’ … the gentrified area around Paris’s Canal Saint-Martin. Photograph: Alamy By rights Le Bar du Caveau, on the Ile de la Cité’s Place Dauphine, one of the …