Death on the Boat Train

“One always embarks
on a John Rhode book with a great sense of security. One knows that there will
be a sound plot, well-knit process of reasoning, and a solidly satisfying
solution with no loose ends or careless errors of fact.”—Dorothy Sayers

From the Jacket:

Fair blew the wind
from France, and the Channel steamer Isle of Jethou rolled a bit in the stiff
south-westerly breeze. But the rough crossing didn’t upset the mysterious
passenger who had locked himself into his cabin as soon as he boarded the boat
at Guernsey. The same desire for seclusion had manifested itself on the boat-train
to Waterloo, for the guard had been presented with a pound-note to reserve a
compartment for Mr. Mystery. But did he travel alone? For at Waterloo the
gentleman from Guernsey was a pretty genuine corpse. Death on the Boat-Train is
a first-rate detective story, once again featuring the coldly clever scientific
mind of Dr. Priestley, John Rhode’s brilliant creation.