Cities fell silent, streets swarmed with strays: monsters that were all once human. At the start survival just meant running, hiding, and staying quiet. But all Frankie Silver wanted was to find her family. But when she found herself sharing space with strangers who killed without hesitation, everything changed.Everyone had blood on their hands.With every day that passed, Frankie began realizing the truth: That the real danger wasn't the strays outside. It was what was right beside her all along.