Molly and Michael dislike their spooky new stepsister Heather but realize that they must try to save her when she seems ready to follow a ghost child to her doom.

Maisie feels hopeless after a leg injury causes her to quit ballet and is not excited for a family midwinter road trip near the Native American community where her mother grew up. She pretends to be strong but on the inside her anxieties and dark moods hurt as much as the pain in her knee.

Abby and her stepbrother, Doc, must persuade Abraham Lincoln to play his part in history after one too many comments about history being boring cause him to go on strike.

Shipwrecked with her family on a remote island, Sarah Robinson learns about the existence of a mysterious Keeper right before her father and younger brother go missing.

When his father remarries and moves his new wife and daughter into the soon-to-be completed Mangrove Hollow, eleven-year-old Nicholas Vargas finds an ally in his new stepsister when a little nixie with a huge problem comes to him for help.

Louis, who loves baseball despite being the worst stickball player in White Plains, New York, sees his opportunity to be bat boy for the 1961 Yankees team as the perfect way to escape the problems of his father's remarriage and moving to the suburbs.

Deaf sixth-grader Macy expects disaster when she is sent to help her elderly neighbor Iris, who doesn't know sign language, pack for a move to an assisted-living home. To her surprise, Iris soon becomes a firm friend who helps Macy face her own upcoming move, into the home of her mother's soon-to-be husband and two young stepsisters.