Liz is trying to help her grandmother prepare the family’s old log house for sale. She’s her grandmother’s guardian angel as she helps with the packing and reminiscing. Though Liz is sad to part with the home, her sadness turns to fear when strange things start happening. First, it’s the girl in the blue dress, then it’s the talking and singing behind the wall and then, one afternoon after a nap, Liz walks through the wall and joins the voices. She becomes a guardian angel to her great-great grandmother, young Elizabeth. Poor Elizabeth is trying to care for her brothers, including the desperately ill Matthew. By being in the right place at the right time with the right remedy, Liz is able to save her namesake and ensure her own future. With easy-to-follow twists and turns, Bauer spins a spooky time-travel story for the youngest readers that will keep them interested without giving them nightmares of their own. A welcome addition to the venerable Stepping Stone series. (Fiction. 7-9)