The traitor, Calder Cob, refuses to speak with the gullible jailor, Ned Pruner, until he has some bilberry cakes.
'You're the one what helped discover that old Calder here was a traitor, ain't ye? Ye have me thanks for that, friend! I was just talking to my Peg about that. You're quite a hero!
'Calder here could probably tell us a lot about what them Blackwolds are planning, if only he'd talk. Thing is, he's refusing to talk until he gets some better food, and he wants bilberry cakes. But me Peg don't have no bilberries to make the cakes.
'Could you maybe go out and pick a few piles of bilberries from the bushes along the river south-east of town? Head south-east from Archet's gates and you you should spot it. If I could just get some cakes, maybe then Calder would talk!'
Bilberry bushes grow near Blackwold's Roost, south-east of Archet.
Ned Pruner has asked you to gather enough bilberries to bake the cakes that Calder Cob demanded.
Ned Pruner can be found at Archet's jail.
You collected the bilberries which Ned Pruner requested. You should return to Ned with the berries.