One of Elizabeth Goudge's great loves
was the Channel Islands,
and several books feature those Islands.

Green Dolphin Street is one of those books.
It's an adventure, and so it's not limited to the islands:
it travels by clipper to New Zealand
in the era when the English were just colonizing the place.

Moreover, there is the homage to Mont-Saint-Michel
in the form of a fictitious convent at the top
of an enormous cliff which, at high tide,
is accessible only by seacraft if memory serves.
One of the characters scales the cliff bare-handed.
When Green Dolphin Street was made into a movie,
with both English and American stars in the cast,
the cliff-climbing scene was a very big deal in the film;
people who have seen the film (not me) recall the suspense.