Young FBI agent Kate Macer joins a top-secret CIA operation aimed at capturing the head of a large Mexican drug cartel. Macer gradually learns the details of the operation, which often borders on law and morality, leading to the deepest depths of criminal hell. Macer's guide through his subsequent circles will be a mysterious CIA collaborator of Mexican origin, called the "consultant", who, as it turns out, is of key importance to the entire operation. His true identity will be the biggest shock for Macer.