From the Publisher:
Beside the dead body of Sir Maurice Lawes are the shattered fragments of a snuff-box that once belonged to Napoleon. These fragments tell a tale, or rather two tales, one true and one false. Now, an English expert in criminology forces the evidence to tell the truth about what happened and to point out the real murderer.
John Dickson Carr: The Emperor's Snuff-Box. Carroll & Graf, ISBN: 0786702230 (August, 1995), 298 p., $4.95.