Every now and then Pathfinder Adventure Paths crossover with the Cthulhu Mythos (in fact it feels as though it happens frequently enough that it is nice to see a series where it doesn't happen). Shattered Star does that in this issue with a journey to the Plains of Leng.
Now I'm not sure the Mythos works for me when you are meant to be hacking through it with a plus two sword of smiting so mileage is definitely going to vary here. What does work for me is the initial camp of giants who are excavating an tower buried in an ancient lava flow and the blue dragon who forms the boss villain of the adventure.
There are two interesting opportunities for alliances: a rebel fire giant and a drow seeking to become a vampire. Both are interesting ideas for non-good/lawful characters and I like the idea that both might survive to recur later in a campaign.
Overall though this is a bit meh. The parts are more interesting that the sum and I remain unconvinced that heroic fantasy and Cthulhu really mix well.