I went on a G.K. Chesterton tear a few years back and thought I'd seen his best stuff.
Please take my recommendation seriously. If you like G.K. Chesterton and you haven't read any of his Father Brown detective stories, you must partake. I picked up a collection on a whim recently and have been richly rewarded.
In Father Brown, I think I see some of the original source material for Columbo. He's underestimated by everyone, but is, in fact, hugely gifted. A lot of it has to do with his underwhelming appearance, but the bigger issue is the poor esteem in which the reason of clergy is held. The simple priest blows that bugbear out the window. He is mighty in the art of detection and much of it has to do with his theologically informed knowledge of man.