The Count Of 9 (A Bertha Cool and Donald Lam Mystery)
by Erle Stanley Gardner
Category: Detective and mystery stories

Hired to protect the treasures of a globe-trotting adventurer, Bertha Cool and Donald Lam confront an impossible crime: how could anything be smuggled out of a dinner party -- least of all a 6-foot-long blowgun -- when the guests were X-rayed coming and going? But that's nothing compared to the crime they face next: An impossible murder...