A LibraryThing Early Reviewers Book.
This book is a good overview of the various mythologies and beliefs of the Celtic world. It touches on the old gods and goddesses, folk traditions, the roots of the Arthurian legends, and some interesting ideas about shamanistic practices. It’s got a more scholarly than new–agey tone to it (a definite pitfall of some Celtic-themed books).
Since it really is mainly an overview, I did come away wanting more, but one of the appendices is Suggested Reading and Further Study, and the Bibliography is enormous, so I’m looking forward to exploring more from both those lists.