Vicky Rivers is a troubled woman, scarred by a violent childhood trauma that has turned her into a killer, but not just any killer. She is a highly skilled assassin in the employ of a powerful and secretive organisation, an organisation that harbours a deadly secret.
Vicky has her own secrets and her own obsessions, obsessions which will set her on a direct collision course with her employer as she seeks out the dangerous truth behind their secret research and the hunt for immortality.

Following her revenge on her brother Jack, Vicky becomes obsessed with killing her nemesis, Talisa Hayes, a young Irish woman who refuses to die. Vicky, now convinced that Hayes is part of a secret experiment, paints a target on her own back as she sets herself against her powerful employer.
Determined to kill Hayes once and for all, she goes off grid to chase her across the globe, from Ireland, Canada, Los Angeles, Italy, and across to Mexico.
An Italian investigator, Sergio, is recruited by Tomasz, the organisation's Polish handler. Sergio must catch up with Vicky and call in back up before she uncovers the truth. What Sergio discovers is far from what he was expecting.