Put that in your mustache and smoke it.

I've often noticed that when coincidences start happening they go on happening in the most extraordinary way. I dare say it's some natural law that we haven't found out.

Then there are some minor points that strike me as suggestive - for instance, the position of Mrs. Hubbard's sponge bag, the name of Mrs. Armstrong's mother, the detective methods of Mr. Hardman, the suggestion of Mr. MacQueen that Ratchett himself destroyed the charred note we found, Princess Dragomiroff's Christian name, and a grease spot on a Hungarian passport.