Children's Books similar to HP

[GypsyCaine]

Original Yahoo! HPFG Header:
No: HPFGUIDX C5019
From: GypsyCaine
Subject: Re: Children's Books similar to HP
Reply To: [Yahoo! #5007] Children's Books similar to HP
Date: 7/24/00 9:32 pm  (ET)

Madeline L'engle wrote three books that I am familiar with: A wrinkle in
time, A wind in the door, and a swiftly tilting planet (my favorite--I
love the rune! And the unicorn)

What was the fourth in the series?

Please, cause I will go forth and seek! I love MEG!
Dee