Alex doesn't have much to her name despite her knack for thieving and her passionate love of Veronica. When Alex is arrested and her relationship with Veronica shattered, she has only one way to clear her name and avoid life in prison.

Years later, and now an asset of the US government, Alex has been transformed into a Special Ops assassin, and she has the engineered genes to prove it. Fighting her way through every blacklisted mission possible, and loving every minute of it, it isn't until she's delisted and on the streets that she meets David, a genetic whiz, who suspects that there's a flaw hidden in her new and improved DNA — a flaw that may prove fatal.

Forging an uncanny relationship with Dog, a canine with incredible abilities, Alex learns that there are more dark rooms filled with government conspiracies than even she knew existed. As they dodge a desperate military, Alex realizes she'll have to face one of her worst battles yet: one of the heart.