Miss Lemon:  It 's nearly complete , you see . My system .
Hercule Poirot: Ah .
Miss Lemon: Every one of your cases classified and cross - referenced five different ways .
Hercule Poirot: _ Five _ ?
Miss Lemon: Oh , yes . In this cabinet , names of witnesses ; in this , name of perpetrator , if known . Victim 's trade or profession . Type of case : abduction , addiction , adultery - see also under marriage , bigamy - see also under marriage , bombs .
Hercule Poirot: See also under marriage ?