I've read the original three stories, and I loved them, because of these things: a) Jenny Twist is a terrific storyteller, one of those true naturals, b) they're not predictable, which to me is the absolute deal breaker with short stories. The second has a particularly 'What the??!!' ending...! c) It's not some made-up thing - the Mantequero is a piece of genuine rural Spanish folklore and d) They convey the atmosphere of a Spanish mountain village so well.
There are also two additional stories in it, which I haven't read yet but will do so shortly - if they are up to Jenny's usual standard I shall want to come back and give this review another star - except we can't give six stars, can we?
Very highly recommended - and the collection is now in paperback, which I shall be getting for some friends for Christmas presents!