Storyline:The border between Mexico and the US state of Arizona has been marked by the drug war for years. The young FBI agent Kate Macer (Emily Blunt) joins an international task force that has set itself the task of finally stopping the local drug trade. But even their first mission in the dangerous border area is completely out of control, as the transfer of a prisoner ends in a brutal ambush. With the help of the mysterious and merciless mercenary Alejandro (Benicio Del Toro), Kate gets away with her life. A little later, she meets Alejandro and his special unit again at the next operation, which, however, as she soon realizes, seems to have very different goals. So it does not take long for the boundaries between friend and foe to fade and Kate increasingly asks who else she can still trust.