When faced with the choice between saving Milo's life and embracing her destiny, Libby Sparks knew there was only one answer. Become the Destroyer. Libby is about to learn that accepting her fate is only the first step in figuring out what being the Destroyer truly means. Libby must reign in and develop her talents while planning to rescue her captive army of Ciphers from the hands of Guardians. Rescuing the Ciphers is already dangerous enough, but everything becomes even more precarious when Cipher hunter, Braden, pushes his way into Libby's life. The strange connection they share frightens Libby, but it also pushes her to trust him despite her better judgment. When Libby's feelings of trust begin to morph into something more, her relationship with Milo isn't the only thing tested. If she is wrong about Braden's motives, everyone involved in the Cipher rescue may pay the ultimate price for her mistake.