Ursula K Le Guin: Threshold

How fortunate that I happened to find Rocannon's World at the second-hand shop recently. Because this book just about did it for my relationship with Le Guin. First that enormous brick of questionmark that was Always Coming Home and now this. Premise is OK - a spot in the woods that's the threshold into another world, where it's always twilight. Discovered by accident by a young man with problems, and one day there he meets a girl who has been coming regularly since childhood. The inhabitants of the world are in trouble and gladly send these two off to meet their deaths. Okay, but what is the point of the story? It got awfully long and tedious for such a short book. It feels like an experiment.