Was ******* Acting Alone? (SPOILERS)
Since we now know who Riddler's killer is, a two thoughts occurred to me. 1) How did she track down the Riddler? The only people that know where he is are Batman, the GCPD, and the Agency. 2) Where did she get the toxin? I'm starting to suspect that Tiffany was a puppet, and that someone else is pulling the strings.