Currently playing on a third attempt. We seem to be at an impasse and can't progress further but we haven't died. We have been back to each location and haven't found anything new. It would appear we are missing one item but no matter where we go, it is nowhere to be found. I'm wondering if we have messed something up and need to just start over.
Check out this post. Reveal the spoilers one by one. Stop when you get it