I'm almost done with this series!!!! The Grey King by Susan Cooper is a story with Will Stafford alone again. or at least without the Drews.
After a long illness, Will's parents send him north to Wales to stay with his aunt and uncle and cousins. They are sheep farmers and the sunshine and fresh air is supposed to help Will convalesce. Will makes friends with a boy his age, an albino named Bran with a dog as pale as he is named Cafall. With Bran and a magical harp Will must wake the Sleepers in the Mountain to defeat the Grey King, which will aid the Light in the next steps to fight the Darkness.
I liked this one a lot as well. Lots of outdoorsy hiking and climbing and exploring. The first part is just kids being kids before cable and video games and ultra-worried parents. The series is very very good and I can't wait to finish it up.