Kenza wants you to deal with the mutineers that cost her the command of her ship.
'My former crew turned out to be mutineers and ruffians, all of them! They must think I perished when they threw me overboard, and I would not survive the swim back to shore. So they are not only dishonourable, but they are fools too! Now they haunt this area of the Fleet-fast, and they stay here in great enough number that the guards fear to engage them in battle.
'But I do not fear them, and neither do you, do you, my new friend? Some of them are tougher than they appear, but that will not be a problem for you, will it?'
Many of the ruffians in the Fleet-fast conducted a mutiny against Kenza and she wants you to deal with them.