Silver on the Tree by Susan Cooper

This book deals with the Light's last efforts to stop the Dark from rising. Will, Jane, Barney, Simon, and Bran must work with Merriman Lyon to save everything. I thought this book worked really well, from a story point of view--that is, the choices that characters made paid them back in kind. Overall, I found the series to be quite enjoyable. They're obviously aimed at an audience that's a bit younger than I am, but they work. They remind me of Lloyd Alexander's Pyrdain Chronicles.