Murder among the dreaming spires? I explore the enduring charms of Masterpiece Mystery ’s Oxford-set crime drama Inspector Lewis , which returns to PBS for a fifth season on Sunday. Over at The Daily Beast, you can read my latest feature, "Morse Code: PBS' Knife-Sharp Lewis Returns," in which I take a look at both Inspector Lewis and Endeavour from within the context of the legacy of Morse and their role within what I'm calling an Oxford crime trilogy. In a television landscape populated by countless iterations of CSI and its ilk—crime dramas where the emphasis is on forensics as crime-solving technology rather than in old school policing—Masterpiece Mystery’s delightful Inspector Lewis may feel like an odd man out. But in the case of Lewis, which returns to PBS on Sunday for a fifth season (or sixth, if you’re going by the U.K.’s numbering system), that’s a good thing indeed. The show, based on characters created by Colin Dexter, is now itself a long-runni...