Now reading Clouds of Witness by Dorothy L. Sayers
Sayers had a way with words. Here is a sentence that says a lot:
"Lord Peter was awake, and looked rather fagged, as though he had been sleuthing in his sleep."
Here is an interesting piece of etymology: Did you know that the word "sleuth" comes from the Old Norse root "slóð", which meant "trail" or "spoor" and still has that meaning in modern Icelandic?