Your client wants you to seek out a local woman whose name was on those papers you found. You have to find out what role she's playing in the plot against your client's husband.
First you will have to talk to an NPC in town. She will offer you to switch sides and to work against your client.
The main part of the mission is a sea battle against four identical level 23 opponents. One of these is the ship that holds the information you need, but you won't find out which one until you have boarded one (if you don't get the right ship on the first try, it will be pointed out to you). You will have two NPC allies to help you.
- Board the Merchant with the Documents
- Find The Merchant Who Has The Documents