William McIlvanney's Laidlaw novels are extended meditations, digressions and observations punctuated occasionally by bits of action, and McIlvanney has the writing chops to pull it off. Luiz Alfredo Garcia-Roza's Rio de Janeiro police inspector protagonist also muses on the nature of his work — no surprise, perhaps, from a character named Spinosa.
Here's a bit of McIlvanney's Strange Loyalties:
"I've seen it go about its business all too often — all those trials in which you can watch the bemusement of the accused grow while the legal charade goes on around him. You can watch his eyes cloud, panic and finally silt up with surrender. He doesn't know what the hell they're talking about. He can no longer recognize what he's supposed to have done. Only they know what they're talking about. It's their game. He's just the ball."
"Neither the question not the possible replies were anything like a real investigation, but they did increase the number of conjectures that told him in his own head something was about to begin. He still couldn't call it an investigation: it was more like an intellectual stew combining very acute observations, subtle rationalizations, and delirious ideas. He considered it to be something like prethought."