Maggie lives in a world being torn apart by cohesion breaks – aka cobeys, which are breaks in reality, where chunks of space are missing. Magic has been outlawed in the Neworld where she lives, in order to cut down on the number of cobeys, which seem attracted to magic. Her own family has had there genes chopped, so that magic doesn’t become active. Then Maggie’s Mom remarries, and Maggie knows that there is something wrong with her new step-dad, (who’s come from the OldWorld where magic is still practices) – he seems to be surrounded by shadows. Then all of a sudden some huge cobeys appear right where Maggie lives. The police come out, and start hauling people away. Maggie and her friends need to figure out what is happening and how they can stop the cobeys. Like most of McKinley’s books this title could easily be continued in a series, but she doesn’t seem to pursue the potential series.