Open Library
Mystery
Every answer hides another question.

Bon Bon Voyage (Culinary Mysteries)
Nancy Fairbanks

A Penny Urned (Den of Antiquity)
Tamar Myers
Revealing the Mysterion
Benjamin Gladd
The Mystery Squad and Mr.Midnight (Solve It Yourself)
Martin Waddell
Fear in the Cotswolds
Rebecca Tope
The Dark Water
David Pirie
The meaning which the word mystery bears in the New Testament
Joshua Toulmin
My Darling Dreadful Thing
Johanna van Veen
Batman
Jeph Loeb
Questions of Faith
Sarah Wallin-Huff
The PMS Murder
Laura Levine
Radio Reporters
John Escott
Confession
Martin O'Brien
Nemesis
Jo Nesbø
Swiped
Michele Martin Bossley
The Mike Hammer Omnibus
Mickey Spillane
San Francisco Noir (Akashic Noir)
Peter Maravelis
Universality
Natasha Brown
Hollywood and Crime
Robert J. Randisi
Evil in carnations
Kate Collins