More detail reviews are here: http://theotherside.timsbrannan.com/
This adventure is really more of hex-sandbox. It is two pages and the central conceit is the characters are stranded here till the next boat arrives so they might as well figure out why the place is dying. There are some suggested quests and some points of interest. There are a couple of witches mentioned. The Gray Lady is the spectre of an old witch. She is also a quest. Dispatch her to help bring the area back from extinction. There is also the remains of a witch cult. They are not described in any detail.
This is a pay what you want product, then by all mean plop down a buck for it. At two pages (no title page or ogl) there is a still a lot here. You can find out more at the author's website: http://games.taskboy.com/#tbg-b
Does it work with The Witch? Yes. Only in teh respect that the adventure has so little detail that it works with anything. Now for some people this is perfect. Indeed I can see a number of sessions based on these two pages alone. You can drop it into any game as a break from the regular campaign. But if you want more meat to your module then this might not be for you.