Whirlwind of Stars

Some worlds end in Fire
Some in Ice.
A whirlwind swept Karsus away.
Sarah Macaran survived.  Kidnapped, struggling with strange powers.  She stowed away in the Toto's cargo hold, but Scarcrow and the Toto's crew have other worries: Dorothy vanished.
Can Sarah unravel the mysteries before the Wind finds her?  Or the Witches of the Galaxy take matters into their own hands?