Near-fine first edition, with slight bruising of top of spine, and a bump to the bottom back corner. In a near-fine unclipped dust jacket with some wear to corners and spine.

Hired to protect the treasures of a globe-trotting adventurer, Bertha and Donald 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