I cannot warm to Tecumseh Fox, and I guess Stout didn't either, given that there are only three Fox novels and dozens of Wolfes. I wonder why Stout took the trouble to set up such an interesting/bizarre menage for Fox (the Zoo), and then never use it after the first book? In this final volume, Fox is a watered-down version of Archie Goodwin, told in a dull third-person--and it is mostly telling. That's what's missing in the Fox books: there is not a spark of wit and his characters are cardboard cutouts, from the German maid to the rich socialite Mrs Pomfret to Diego Zorilla with his (according to Fox) "courtly Spanish manners" which to me seemed like extreme rudeness. Zorilla grunts in reply, hangs up on people, refuses to speak when spoken to, even refuses a free meal and drink in the most blunt terms.
According to whoever wrote the foreword to this reedition, this is the best of the Fox novels. I haven't read Vol 2 and I doubt I will. Actually, looking back on my reviews, yes I have read it and it was a bizarre experience, being a reworking of a Wolfe novella. Bland, hard to believe and dull. The reason for the triple murder was...well, there it was, but I doubt anyone would ever actually kill three people in such outré fashions for that reason.
Oh, and while we're on the subject, there's a huge difference between a "musicale" (private recital, often held in a wealthy person's home) and a "musical", ie a play or movie that serves as a vehicle to present songs and dancing. The editors/proofreaders missed that. Repeatedly.