There's a smartphone app capable of crashing a commercial jet. And it's for sale to the highest bidder. Attorney Sasha McCandless is closing in on the prize: After eight years of long hours, she's about to make partner at a prestigious law firm. All she has to do is keep her head down and her billable hours up. Then a plane operated by her client slams into the side of a mountain, killing everyone aboard. She gears up for the inevitable civil lawsuits. But, as Sasha digs into the case, she learns the crash was no accident. She joins forces with a federal air marshal and they race to prevent another crash. People close to the matter start to turn up dead. And Sasha's next on the list. She'll need to rely on her legal training and Krav Maga training in equal measure to stop a madman and save herself.