There's a fairly interesting mix of stories here, some quite good, and a few that really didn't work for me. The latter are mostly those that ignore what are, to me, fairly important aspects of Mythos stories. Two major examples of this are Passage to Oblivion and The Star of Istanbul. The former introduces a vaguely explained semi-immortal group working for the good of humanity, which felt far too inconsistent with the idea of humanity's general insignificance and lack of hope in the Mythos. The latter story is told in part from the point of view of a Deep One and gets far too close to giving Cthulhu understandable goals, along with including a technological artifact that is too understood by the humans involved.
On the other hand, there were some excellent stories here. Some of the best include Signals and Ice, which deal with things that are terrifying and mysterious and most importantly, never properly explained or identified. It's fun to read stories with recognizable aspects of the Cthulhu Mythos, but it's also nice to have stuff that surprises you just as the original stories were meant to. Dark Blue and High Seas are excellent stories dealing with the Deep Ones, and a number of good tales involve deadly encounters with a single Shoggoth. I had expected to largely encounter Age of Sail stories here, due to the title and cover, but there's actually a fair variety of stuff dealing with the modern day as well as sailing ships and pirates. All in all, I generally enjoyed these stories a fair bit, and there were at least one or two that were genuinely disturbing and scary. I'll have to look for more stuff by this publisher at some point.