Falling in love with Brennan showed Skye a world she'd been taught couldn't exist. Since then she's saved his life multiple times, and dealt a severe blow to the Society in the process, but all is not as it seems.

Skye's nanites continue to adapt at an astonishing rate, making her quite possibly the most dangerous person on the planet, but fighting a guerrilla war against her former masters involves situations she's not prepared for, situations where she won't be able to save everyone, situations where she's no longer sure she's fighting on the right side.

Desperate to end the fighting, Skye sets off on her most dangerous mission yet, and what she'll learn this time may very well destroy her.