After you learn that Frank was murdered and send him on his way, we return to the park to find Rosa lying in the mud (you'd think she's learn to sit down before she yanks on that tie) and Joey being threatened by some vicious old whackjob.
Hint 2
If you played the last game, Blackwell Unbound, you probably recognize her. If not, well, just hang on; Joey will explain when you get home.