This is probably the worst module in the first season of AL. The reason for that is almost entirely due to the fact that there is basically no way for a party to figure out what is going on.

What's with the demons? The islander's motivations prevent them from ever disclosing any information

What's with the demon pirates? The only way to find out about them is going somewhere that there's no reason to go

Why are there two ships? Apparently there are two threats, but nobody will tell the PCs that.

The worst part, though, is that nobody will tell you anything even after the module is over. Regardless of what the players do, they will earn the ire of everyone on the little island who could provide any answers ensuring that none will come. It makes the whole thing exceedingly unsatisfying.