The relationship between the parties is what is most interesting, and there are differences of culture and religion that are centered here. Woolson sets a lot of the story around a sort of exaggerated Catholic mystery: the nun, whose world is the convent and the men take for being rather dull and of limited mind, ultimately saves the men in a storm.
(This act leads the lighthouse keeper's very Protestant wife to begin attending a local mission weekly.)
Anyhow, this has nowhere near the mystery and beauty of St Clair Flats or some of the stories from that earlier volume, but it does show off Woolson's interest in defined subcultures, or in moments of cultural/religious difference.
That's what stood out to me from my reading of her earlier, and I hope one or stories from this collection do that interest a bit more justice.