The "crook quotes" were the phrases found under each crook's name in the Dossiers. The quotes were a
type of cryptic clue. You substitute city puzzle answers for words in the clue and follow the resulting
directions found in the clue.

Lou Nieben

Finally crazy about science after one test
LAST                AI            THE GRADUATE RECORD EXAMINATION

= THE GREAT SAIL
(one test is THE GRE; after that is "mad" LAST around AI)