A martial arts instructor is recruited as a bodyguard for a high-power couple, but on her first day of duty, her employers are kidnapped. Desperately searching for the couple, she finds cryptic messages from the kidnappers leading her into a deadly world of underground fighting. As the culprits force her into the ring, her martial arts skills are tested, getting her steps closer to freeing her clients. But before she can save them, she must face the ultimate challenge - and fight for her own survival.