With her memory still fragmented, Ava returns to the International Sensory Assassin Network (ISAN) to find the twin sister she never knew she had. But as Ava hunts for information, she finds herself tangled in a web of yet more lies and conspiracy. The Helix serum may not be required to access her superpowers, and the number of male assassins-previously considered too volatile to tolerate Helix-is growing in every territory. The more Ava uncovers,...

Behind enemy lines. New soldiers will emerge. Unexpected heroes will rise. Ava is a prisoner. And she is not the only rebel held hostage at ISAN's secret compound. As she plans an escape, the lives of the rebel prisoners are in her hands, along with those she thought were dead. Rhett and his team desperately search for Ava while one of the Remnant Council joins forces with another network looking for the creator of the Helix serum. And time is running...