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. Theone and Theotherone Thattoukit Topless racket doubled around station; ugly Greek accessory takes team member hostage DIN FREQUENCY DORIC TIE ORR = INFINITE CORRIDOR (IN + IN with F in the middle; TIE and DORIC "ugly," that is, anagrammed, around ORR)