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. Pia Nissimo Music and method force unit to be mixed up with FUNK BOTH MODUS OPERANDI NEWTON evidence the wrong way LOOT = TOMB OF THE UNKNOWN TOOL (anagram FUNK, BOTH, MO, NEWTON; add LOOT backwards)