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Some police procedurals he may like:
Inspector Lynley series by Elizabeth George, the first book in the series is A Great Deliverance
Arkady Renko series by Martin Cruz Smith - first in the series is Gorky Park. He's a russian police investigator who goes rogue in later books.
Sheriff Walt Longmire series by Craig Johnson, first in the series is Cold Dish. Set in Wyoming, lots of tongue-in-cheek humor.