Well, I'm a little fanatic about those things. I did investigate in the city near the harborage about the worm cult spy, but I missed the option to persuade one of two characters to ask for informations instead of simply ask anything else, believing that I could still use the persuasion after that, but I did a mistake. I'd want to restart the quest, but unfortunatly I cannot because it is one of the main storyline. Is there someone that can tell me what should have change in my quest hints or objectives? Or better, some staff that can fix that and let me redo the quest?