Some Buried Caesar by Rex Stout
This may be my favorite Rex Stout novel. For one thing, it’s early enough in the series that Wolfe is still regularly breaking his ironclad rule never to leave the house. Here, an orchid show in upstate NY pries him out of Manhattan, proves his horror of automobiles, and lands him at a dairy farm where he’s faced with the murder of a victim already marked for death. Even better, this is the one where Wolfe and narrator Archie Goodwin first meet Lily Rowan. She calls Archie Escamillo (after the sexy bullfighter in Carmen), while entrancing every man in sight; he calls her bauble, plaything, and trifle, while recruiting her to help solve what’s now a multiple murder case. The banter is delightful, the plot is satisfyingly complicated, the cops and suspects are antagonistic but never stereotypical, and I learned a lot about cattle.