Max discovers that Zack is not only alive but apparently benefiting from some cybernetic enhancements to his genetic engineering, however he does have memory problems. Knowing that Zack sacrificed his life for hers, Max puts herself at great risk, attempting to rescue him from his new ""owners,"" a vicious Seattle gang but when an attempt is made on Logan's life, Max is faced with a very painful decision.

After Max is shot and hospitalized, Logan must intercept White and a very curious CDC doctor in order to keep Max's transgenic identity undercover.

Max must break her vow to avoid Logan after Joshua's friendship with the blind woman makes him a target of a transgenic manhunt in the sewers. Meanwhile, White leaks news of the human-looking X-5s to the media, leading to a wide-scale attack against the so-called ""monsters"" running amok and to the death of a someone dear to one of the transgenics.

Max's life is placed in more danger than ever before when she is hunted by the one person who knows her better than anyone -- her clone. Though even the existence of this exact replica is news to Max, she quickly realizes the imminent danger from an individual who can get inside her head and infiltrate her life like no one else. Dealing not only with this new threat but also the disintegration of her relationship with Logan and Joshua's disillusionment over not being able to go out in public, Max must race against time to figure out how to stop this deadly enemy before it's too late.