Scarlett had spent years in the underworld, so of course she knew what those bandits, thieves, pickpockets, pirates, and mountain brigands wanted.
What they wanted was simple: wealth—plainly put, money. And where along Faerûn's western coast had the most wealth right now? Naturally, the legendary Ocasuan! Once they understood that, everything else was easy to arrange.
The plan itself was very simple to carry out. They only needed to send a few people to Mother of Mists Island to spread news of Ocasuan! As long as they told those pirates that someone on Mother of Mists Island knew Ocasuan's exact circumstances, those greedy bastards would swarm over like rabid dogs spotting a chunk of fat meat!
And this job was best suited to Harris and his group. After all, these people were bad guys to begin with; once they got to Mother of Mists Island, they would not need to pretend at all. They could simply be themselves. Scarlett also had channels for contacting Mother of Mists Island, so getting a few people onto the island was incredibly easy.
Scarlett even went personally to ensure the plan went smoothly. After all, if several outsiders suddenly arrived on an island full of pirates and began spreading news about treasure, there were usually only two possible outcomes. One, people would take them for idiots and ignore them. Two, they would be seized and brutally tortured, then killed to keep the information from leaking.
So they had to find someone influential on the island who could make the other pirates believe the news about Ocasuan! Naturally, it was impossible to make those vicious pirates cooperate willingly, since Scarlett's group intended to wipe out every pirate on Mother of Mists Island!
So Scarlett had to go!
To do what? Seduce him?
Of course not.