Dr. Miranda Green has written many books on many aspects of Celtic culture and literature. This inexpensive book is intended to be a short introduction to Celtic mythology and the culture whose beliefs and customs gave birth to those myths. This book is also appropriate for readers ages 12-14. Those who want more in-depth exploration of the myths and the culture should consider The Irish Literary Tradition by J. E. Caerwyn Williams and Patrick K. Ford or Celtic Heritage by Alwyn and Brinley Rees.
A good, short introductory reference book for those interested in exploring and understanding the basic belief system and history behind Celtic mythological tales (The Mabinogion, the Fianna, et al).