Open Library
Mystery
Every answer hides another question.

Frog in the Throat
Elizabeth Ferrars

The Secret at the Seashore
Laura Lee Hope

Rest in pieces
Rita Mae Brown

Blue Christmas
Mary Kay Andrews

Sour Puss
Rita Mae Brown

Sherlock Holmes vs. Dracula
Loren D. Estleman

The pizza monster
Marjorie Weinman Sharmat

Orfismo e paolinismo
Vittorio Macchioro

Be Shot for Sixpence
Michael Francis Gilbert

The Vanishing Thieves
Franklin W. Dixon

Rusty Nail
J. A. Konrath

Mistaken identity
Lisa Scottoline

The Assize of the Dying
Edith Pargeter

Cam Jansen and the Mystery of the Carnival Prize
David A. Adler

Saturday the Rabbi Went Hungry
Harry Kemelman

A Map of Glass
Jane Urquhart

Enemy in the House
Mignon Good Eberhart

The menace within
Ursula Curtiss

The Case of the Left-Handed Lady
Nancy Springer

Appleby and Honeybath
Michael Innes