Seventeen-year-old Karis Singh's little brother is dying and the Corporation's Analysis has concluded that he's not worth saving. One thing is stopping her from going into the city and stealing the medicine herself-the tattooed Mark that physically bars her from entering. The only way around that is to get it altered in the Black Market- an act that carries the possibility of a horrific and slow death- but will guarantee her the access she needs. Willing to do whatever it takes, she accepts the help of the mysterious Ethan, a boy with an agenda of his own and who knows too much about the enemy. As her time in the city passes, dark secrets are uncovered about the Corporation and what really happened to her brother. When the tables turn and the stakes get higher, Karis is forced to align herself with the deadliest beast of all, risking everything in order to save those she loves. Now, the most treacherous part of Karis' plan is staying alive long enough to make it back home.