"Grubnub don't know!" Grubnub cries, eyes filled with terror. "Tuky ran aWAY-hay-hay..." He sobs. "Grubnub didn't kill the villagers. Byuchyuck and Grimble find the house here. Grimble says we search the house, so we search the house!"
It doesn't seem like Grubnub is lying, but it doesn't seem like he's telling you everything either. Scared half out of his wits, Grubnob starts to sob.
SpoilerEveryone roll spot checks and sense motive checks.