I was told to find some evidence in Roneals estate (done)
I was also told to find and investigate a man name Barg in the Docks area.

I could never find the "Barg" guy...

Corgeig Axehand says I need to find another piece of evidence besides the accounting book I found at Roneals estate.

I could never find that Barg guy - and I have no idea what to do.

Thanks for any help!

Go all the way to the bottom of the Docks map and you should find Barg. He's standing right at the bottom of the steps (where Xzar the mage was), just below the Seas Bounty.

You also need to get the documents from the guy by the bar in the corner of the Sea's Bounty.