You will encounter Cadby soon after entering Orobas Fjords if you head down the switchback trail towards the beach. He is being attacked by Goblins. If you help him fight them off, he will reward you with 1000 gold. If you threaten him, he will reward you with 1500 gold instead.
You can mind-read him. His thoughts are Ew. Lucky it's laundry day. This doesn't seem worth the XP cost.