Pathfinder Adventure Card Game: Skull & Shackles

We have been playing Pathfinder Adventure Card Game: Skull & Shackles on a Thursdays for a few months.
Our party consists of Damiel, Feiya, Orloch, Ranzak and Seltyiel.
We are on adventure deck 6: From Hell's Heart the photo is early on during the adventure, when we there doing well.

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This adventure only has villains in it and the main villain can only be defeated, if, all the other villains have been defeated first.
We failed to complete the adventure having 3 locations still open.