Blum (Those Who Save Us
) visits Tornado Alley in this vivid novel about a set of twins with a dark history. At home in Minnesota, Karena Jorge gets an unexpected call informing her that her twin brother, Charles Hallingdahl, whom she hasn't seen in the 20 years since something went very wrong during a storm chase, has been admitted to a Kansas mental hospital. Charles suffers from rapid cycling bipolar disorder, and all Karena knows is that he refuses medication, he can be a danger to himself and others, and he is still obsessed with storm chasing. When she rushes to the clinic and finds he has already left, Karena joins a professional storm-chasing tour company, hoping to find her brother in the caravan of watchers who follow major storms. In the course of the tour, Karena confronts the past and the way it has shaped her life. The unpredictable and dangerous storms provide a framework for an exploration of the bond between siblings (and its limitations), and Blum renders the stormy backdrop as richly as she does her nuanced characters. (May)