Adventure 8 - Serpents of Scuttlecove

After defeating the koprus of Golismorga and the City of Broken Idols, the party discovered that a disturbing number of shadow pearls have already been shipped to Scuttlecove. Worse, upon returning to Farshore, they find Lavinia abducted, stolen away to the same city by her brother Vanthus, now an undead menace.
The party travels by boat to Scuttlecove and on the way are contacted by Harliss Javell. She asks them to meet her at a place called Red Foam Whaling in Scuttlecove, whereupon she'll do what she can to aid them.
When the party reaches Red Foam Whaling, they are ambushed by yuan-ti. The party discovers that Harliss has been captured by the Seventh Coil. Their search for Lavinia and Harliss takes them through the streets of the depraved city. From Tyralandi, a brothel madam, the party learns that Harliss is being kept prisoner at The Birdcage.
The party assaults the birdcage and destroys the harpy occupants. At the top of the birdcage, in an actual birdcage, the party discovers Harliss. They rescue her and return to the The Rusty Shunt, allowing the pirate captain to recover from her ordeal.
With the information that Harliss provides, the party then launches a surprise strike at a Seventh Coil safe house called the Minting House. The party defeats the yuan-ti and the crimson fleet associates. Information found within the Minting House now leads the party to the Crimson Fleet headquarters.
The party can discover the hidden pirate base and launch their assault. But the pirates are not easily defeated and several partymembers are slain. The rest of the party has to retreat so they can revive their fallen allies.
Once the dead are brought back amongst the living, the party launches a second assault. They can defeat the outer defenses and are now ready to enter the main fortress, a ship's graveyard suspended amongst giant trees.
The party enters the suspended ships and can defeat most of the inhabitants including several demons and the Crimson Fleet high captain but they fail to kill the leader of the Seventh Coil, a massive yuan-ti anathema that escapes into the marches. Yet for all their efforts, they have not yet found any sign of Vanthus or Lavinia.