M G Nelson

When Sig finds herself under a collapsed barn on her farm she falls through a portal which brings her into a different dimension, a strange world filled with gruesome creatures, dangerous centaurs and gracious and magical fairies and butterflies. She finds herself not alone when she bumps into Reggie, who she at first doesn't recognize to be her own cat from her life back on the farm, as he's changed into a boy.      

Sig soon finds that she has a special power which is prized in this strange world. She can see images, people and present happenings through a piece of mirror which she found during her dangerous journey. Throughout the story, the pair stick together in this dark and mysterious world, each on their own mission leading them into outlandish towns and landscapes and meeting bizarre and entertaining characters.