Full reviews are here: http://theotherside.timsbrannan.com/
A 24 page OSR adventure (2 covers, toc, ogl, 3 maps). It's a good adventure of the "there is something strange going on in the woods, let's investigate!" type. The hazards make this more of a challenge for 3-7 level characters instead of say 1-3. That is fine really. I would use this to lull seasoned players into a false sense of security and then show them there are still dangers to be had in simple settings. This is the perfect adventure for say a lazy afternoon. You can drop it nearly anywhere in your world. Our main bad gal is Llorona, Witch of the Tarriswoods. She is a 5th level magic-user.
Does it work with The Witch class book? Yes. I say change Llorona to a 5th or 6th level witch and give her some more spells. Given her name, dress her in blue and white gowns and focus on water-based spells. change the "wizard staff" to a trident or tined fork. This would make her much more of a threat.
If you have a couple bucks and need something fun for the afternoon then this is a great choice.