A serial killer is targetting villains and anyone associated with the old Batman and they're going by the name of the Batman villain H.U.S.H.
Sometimes a really good story can break a character and I think that's the case with Batman Beyond: Return of the Joker. It's a phenomenal film, but it's also been the template for far too many comic stories. This book essentially rips off that basic plot, misses the spirit and susbtance of it and adds nothing interesting to the story. It also doesn't make a whole lot of sen in light of the JLU episode, "Epilogue."
This isn't horrible, but it's a below average story with nothing to commend it.