Liesl and Po by Lauren Oliver

Liesl is locked in the attic by her stepmother after her father's death in Liesl and Po by Lauren Oliver (Lexile: 830; Interest Level: Grades 3-6).  While in the attic, Liesl meets Po, a ghost from "The Other Side."  When an alchemist's apprentice named Will leaves the wrong package at Liesl's house, the three of them are launched into an adventure of magic and mystery.  While Liesl and Po are searching for the answers to what really happened to Liesl's father, they are being chased by the alchemist and his patron because Will has asked them for their help in escaping.  Readers who enjoy adventure and ghosts will enjoy this 2015 Indian Paintbrush Nominee. (307 p.)