During the spooky parts or the various endings. A+. Definitely set the Lovecraftian tone and full homage to the Cosmic Horror story trope. But I'm not sure what the heck was going on with the dialogue, especially if you go down the "witches path". Anette and Erynn reads like they learned how to talk from a really bad LARP.
Otherwise, the mechanics and the new investigators were great. I really wondered how fresh new adventures would feel especially after how rote Arkham 3rd ed felt for me. Carcosa had an amazing story experience but Forgotten Age and Circle Undone really knocked the ball out of the park for me in terms of mechanics in the scenarios.