1."Introduction", by Peter Ruber 2."Reception in Elysium" (poem) by Mary F. Lindsley 3.Terror Over London [novel] 4."The Adventures of Gresham Old Place" 5."The Adventure of the Burlstone Horror" 6."The Adventure of the Viennese Musician" 7."The Adventure of the Muttering Man" 8."The Adventure of the Two Collaborators", by Peter Ruber 9."The Adventure of the Nosferatu" (with Mack Reynolds) 10."The Adventure of the Extra-Terrestrial" (with Mack Reynolds) 11."More from Dr. Parker's Notebooks"
August William Derleth was an American writer and anthologist. Though best remembered as the first book publisher of the writings of H. P. Lovecraft, and for his own contributions to the Cthulhu Mythos and the Cosmic Horror genre, as well as his founding of the publisher Arkham House (which did much to bring supernatural fiction into print in hardcover in the US that had only been readily available in the UK), Derleth was a leading American regional writer of his day, as well as prolific in several other genres, including historical fiction, poetry, detective fiction, science fiction, and biography
A 1938 Guggenheim Fellow, Derleth considered his most serious work to be the ambitious Sac Prairie Saga, a series of fiction, historical fiction, poetry, and non-fiction naturalist works designed to memorialize life in the Wisconsin he knew. Derleth can also be considered a pioneering naturalist and conservationist in his writing
The Final Adventures of Solar Pons (1998) was the last of the SP collections, and joins SP Chronicles (1973) as containing the best of the original Derleth tales (with the exception of a couple of dud adventures). If you just want a sampler of Derleth’s detective, skip the earlier collections and start with The Chronicles and The Final Adventures (maybe then try 1965’s Casebook of SP). I’d leave the earlier stories to the side, visiting them only if you really get into these.