Three Mysteries has 38 pages.
Horrid Mysteries has 200 pages.
The Mysteries of Pittsburgh has 297 pages.
Asimov's Mysteries has 240 pages.
The Union Club Mysteries has 216 pages.
they usaully have 80 to 90 pages
The Best Mysteries of Isaac Asimov has 345 pages.
they are very short books about 100 pages long
The Missing Mummy by Ron Roy is 96 pages.
The Scribes from Alexandria has 260 pages.
The Three Palladins has 244 pages.
Three for the Chair has 183 pages.
Curtains for Three has 247 pages.