"A witch called Old Auntie is lurking near Dan's family's new home. He doesn't believe in her at first, but is forced to accept that she is real and take action when his little sister, Erica, is 'took' to become Auntie's slave for the next fifty years"--
Young Mollie traverses eerie, perilous lands to retrieve her baby brother, Thomas, from the Kinde Folke, malicious sprites who snatched him and left a hideous changeling in his place.