Project Genesis Quest Help

I have the Project Genesis Mod, found a Dr Tabuchi in a bar in East Avalon. You can offer to help him and he says he'll give you a lot of money if you bribe a guard in Heng. Some nonsense comes up about relations with !!Bribe the Guard! Talk to any guard, they'll ask you to speak with the Shinobis about some competition. !!Extort the Shinobi! Talk to Ninja Boss (I think it would've worked for any Ninja in Heng) and he tells you to get rid of a stone rat in Heng, but don't kill him. !! Rat-be-gone! Cannot find this dude anywhere, I've checked every building in Heng and Traders Edge, and checked everybody walking around for three days. Can anyone help me out? I've run out of options for places to look