I was just pointed to a review of A RISING MOON in the Library Journal, and it's a very nice one. Here's the abridged version (without the recap of the plot spoilers):
In this sequel to A FADING SUN, Leigh returns to his setting of an alternate first-century Britain… Newcomers can easily follow the story without having read the earlier book. Fans of Melanie Karsak’s HIGHLAND RAVEN and similar Celtic historical fantasies will especially enjoy. VERDICT: ...This fast-paced, character-driven fantasy will keep readers flipping pages right to the end.