Over all the plot is interesting, with enough twists to throw the unwary off track. Some aspects are a little troublesome in that if the party is lacking a particular skill, it's difficult to advance the story. (someone with Tracking is virtually a must!)
The story itself is engaging, and the NPCs well-fleshed, with plenty of specifics but enough room to allow for GM creativity.
The challenges of the case are such it will not be an easy walk, requiring the full range of combat, social and investigative skills to deal with them.
Aspects of the timing becomes tricky if the party dallies much at all, but they won't know that until the window of opportunity has already closed. Tying in the right culprits into the right places may prove a bit of a challenge for those not of an investigative bent. Combat has the potential to become overwhelming if the group has "kicked the hornet's nest" too hard.
All in all, it's an interesting case for even experienced Rippers, though newer groups would do well to bring numbers.....