Finlay could ask what the Graf ate with him when they met.
"The champion and I are going to the Great Lounge. I would like dwarf beer, if we have it. Also good tobacco, preferably from The Moot. And a light meal - some bread and cuts of cold meat."
He could ask him if he recalls from which Karak Julian is
"Ah yes... Karak Norn... I visited that hold once, many years ago." The Graft smiles, staring into space as he relives his memory. He drinks a little of his beer, but doesn't touch the tobacco or the food - he seems to have ordered them for Julian's benefit.
Where the group has been already
"most useful over the past few months. I am sorry to tell your grace that there are strange machinations in the Empire. Me and my friends have foiled plots in Bogehnafen, at Castle Wittgenstein and in Altdorf itself. And now we believe that Middenheim is a target of some such plot. These plots seem to be connected to the ruinous powers, my lord. This may be hard to believe for the average citizen but I know that you will know the true danger here and not dismiss my story as some fairytale paranoia.
And on what mission the Graf did sent his Champion
"Blackmail? Magic?" the Graf says, frowning, "how can that be possible? But you are my champion, and I suppose I should listen... I'm afraid I don't really know what those tax laws consist of. Everyone was so insistent that they were necessary for the city finances... and I find it so hard to concentrate on business since my wife died... perhaps I have neglected my duty. Investigate then, champion, and return to me with proof."
In doubt I would say the confused one is more likely the real Graf, also the dagger is less of an assassins weapon using the piece of rope would have left no blood stains which might have indicated a struggle.
