Ok, so here's a pitch or 6. Just as steampunk is High-tech from low-tech power sources, So to do man's high goals remain nestled in basic drives. To reach these ends, the nobles are willing to do anything and everything, including using the 'rabble' to feed these plans. As more and more people disappear, citizens begin to worry that they'll be next. It's falls on the shoulders of those strong enough to root out this nefarious plot and discover secrets not meant for the common folk.