Book excerpt: The author of the runaway New York Times bestseller Those Who Save Us returns with a powerful novel about twins who must confront a dark secret from their past. Jenna Blum's debut novel became a grassroots sensation and was a New York Times bestseller for more than a year. In this emotional and provocative new novel, Blum asks the question: How far would you go to protect a sibling-and at what cost to yourself? As a teenager, Karena Jorge has always taken care of her twin brother, Charles. Obsessed with severe weather, Charles, who suffers from bipolar disorder, begins chasing storms. Refusing to take his medication, Charles soon involves them both in a terrifying tornado chase-with deadly consequences. Now, two decades later, Karena must find her long-estranged brother before he reveals the dark secret from their past or hurts himself-or someone else. But there is only one way to find him: the storms.