When Worlds Collide: Book Four, Air (ON HIAT...
There's no place like home.
Sam remembers when she used to dream of coming back home to get family. Now that she's back, she realizes that it's not all that it's cracked up to be. During the day, she struggles to remember who and where she is, and by night she's in the Spirit World, visiting with Aang and helping in the search to find the portal back.
Ursa aids when she can, but it's hard when she's just as trapped as Sam is. While the two women struggle to keep their secret, their friends struggle to find them.