Forthcoming from Princeton University Press, Ireland’s Immortals: A History of the Gods of Irish Myth (2016), by Mark Williams.
Think of the “Finding a God” and “Finding a Goddess” chapters of Ronald Hutton’s Triumph of the Moon — but book-length, dealing with Irish material, and the product of numerous quests through textual tunnels wherein dwell the ferocious beasts.
All of the Celtic Reconstructionist Pagans out there will probably rush not to buy it. Someone should — he is a fine writer.
From the scraps of his research that I have seen, readers (me included) should prepare to end up in places quite different than they expected.