For fans of the bibliomystery, this ticks lots of boxes.
A book collector is murdered in his library, with books strewn around. The amateur detective, Theodore I Terhune, is a bookseller and author of detective novels, and the murdered man was a client. Solving the mystery involves book catalogueing, book auctions and antiquarian book vendors. Reading books provides some clues, and there is a "book within a book" to contend with.
However, this is far from being the best in this entertaining and revelatory series.
There are the occasional longueurs,and rather too much which is not even tangentially relevant to the plot. Some of the solution comes from a chance reading of a book of arcane South American lore, and I felt that chance played too much of a role here.
A much smaller part is played by the feisty Julia MacMunn,and, given that the other woman in Terhune's life, Helena Armstrong, is now engaged, what, I wonder, will happen in Tommy's life outside books and detection?
Overall, a recommended read.
3.75 stars.