Detective Comics #845

In Detective Comics #845, titled "The Riddle Unanswered," Batman investigates a series of murders where the killer leaves white lilies. The Riddler also publicly attempts to solve the case. Batman, frustrated, joins an online detective chatroom, unknowingly conversing with Detective Chimp and the Riddler under pseudonyms. Catwoman makes a brief appearance, questioning Batman's romantic life. The Dark Knight ultimately uncovers the killer's motive: a revenge plot against the Riddler for a past tragedy. This issue is notable for the unique interaction between Batman, the Riddler, and Detective Chimp in the online forum.