Honestly, if I could give half stars, I would give "The Goddess Letters" 3 and a half, but I can't and didn't enjoy it enough to give 4. I ordered my copy through Amazon.com as I wasn't able to find a copy at a reasonable price in Aus - it came to me used from a Nebraskan public library - and I was SO looking forward to reading it.
The first half (or so) of the novel is a fictionalised correspondence between Persephone and Demeter relatively faithful to the Hymn to Demeter. It's very well done and captures the irratic nature of thought influenced by both the grief and trauma of the abduction.
The second half (or so) covers the ages following the reunion between mother and daughter up until both retire from their Queenly duties after their rites are abandoned in favour of the more modern major religions. In my opinion the author took a risk here, this continuation was not as well done.
Although it did well to show the changes in Persephone as she had grown from Maidenhood to her Queen-self of the Underworld, I got a sense of Orlock's bias against the modern religions that I would have prefered not to have seen. The bitterness and resentment was to be expected from a Demeter who was watching her Temple destroyed over and over again and the Mother Knowledge neglected, but the language used to describe this was too modern to me and reminded me faintly of that used by those involved with the early Neo-Pagan Goddess Movement. I was slightly disappointed that Orlock wasn't able to maintain her previous standard of writing that introduced words like "year" and "war" as brand new concepts.
On a different note, the cameos of historical figures such as (Ho)mer and Alexander and Persephone's affection for Ceberus gave some light and fun for me. In fact, the whole Boeotian/(Ho)mer subplot was very well done and interesting to follow. Without such additions I think the plot may have lots something for me - with a purely immortal list of characters I would have found something lacking in Demeter's experience.
All in all, "The Goddess Letters" was a good, satisfactory read. I'm not sure everyone would appreciate it, but then not everyone is meant to I don't think. I'd be interested in reading something along the same lines, although I was not at all impressed with Neil Gaiman's American Gods - urban fantasy isn't my thing.