This is a Purist adventure, where there is no resolution or satisfaction, just the bleak reality of the Mythos to discover. In it, there are strange birds around... from those surrounding a mental patient to others who hang around watching, watching... and when dissected, they're not quite right. Purge all thoughts of Hitchcock's The Birds, this is far worse!
The horrible truth is revealed straight away for the Keeper and then there are notes on how the party actually gets involved. Those with connections to medicine or psychiatry may hear about the mental patient who is convinced that the birds he feeds are watching him. Scientifically-trained ones may get involved in research that appears to suggests that the results of experiments change when these weird birds are around. A biologist or vet might catch one and cut it up... all roads lead to a university library where there are further clues as to the location of where these birds roost, and a couple of deaths will likely precipitate the climax of the investigation... entering the caves from whence the birds come.
Interestingly, not all the answers are there to be found. It's done on purpose to unsettle and frustrate - and is indeed true to Lovecraft's own stories which always raise more questions about his monsters than ever get answered. Enjoy playing with the characters' minds! Should they wish to investigate further in subsequent adventures, the Keeper is welcome to come up with his own answers.
Five Investigators tailor-made for this adventure are provided, and they are woven into the plot well. If you prefer to use other characters, you will have to do this work over, although you do have an excellent example of how to do it before you. Likewise, all the major NPCs are described complete with role-playing notes: things like suggested mannerisms and gestures to help you bring the character to life during play. The 'Directed Scenes', where we catch a glimpse of each Investigator's Source of Stability, are also tailored both to the pre-generated characters and the adventure itself, so if you're not using them you have more work to do!
The scenes, and the clues to be found in them, are described atmospherically. Here there is a bit more room for you to introduce a party other than the one provided, once you have come up with good reasons for them being in these places... and as they progress through the clues, the odd birds will begin to watch them. At some point - unless you have a party who has diverse enough interests to have split up to visit different places - the Investigators need to meet up and agree to work together, which may need a bit of firkling with travel times and other things to get them into the same place and discovering that they are all interested in weird birds. That done, there's some fascinating library research - now going to the library is common in Cthulhu-related games, but this time it's genuinely interesting and meaningful - before heading off to the Lake District which is where it appears that the birds originate.
There are some wonderful opportunities to mess with your players' heads which, if used with care, can get really spooky and make for a memorable adventure. After the adventure's climax, there are suggested epilogues - Directed Scenes which loop back to the opening scenes with the Sources of Stability in a remarkably creepy way.
If you like classic Cthulhu mythos adventures, you'll love this one. If you've never tried the Purist style before, it might convince you to explore it more thoroughly. Just watch out for those birds...
[5 of 5 Stars!]