Anne DeWitt is a high school principal--however, her entire life is a false identity, which she adopted after she was fired from her job training killers and assassins at an unnamed academy. At her old job, she made enemies who want to track her down and kill her.

One morning, her routine is disrupted by a man breaking into her house to kill her. She kills him instead and disposes of his body, peeved that she'll make it to school 50 minutes late for the first time since she's had the job.

At school, the baseball coach, Holt Halsey, tells her he found out his star baseball player, Clay, was molesting a mentally disabled girl. After this meeting, Anne already had a meeting scheduled with Clay's parents, at which they ask her if the school will create a baseball video of Clay for college applications. Anne, angered by Clay's actions, says she'll talk to Coach Halsey and get back to them.

Anne goes home for lunch and on her way back sees Holt's car pull out from the road down which she hid the body that morning and follow her to school. She becomes sure he found the body, and that he knows. At the end of the school day, he reveals to her that he knows who she is; his little brother was in one of her fight classes at the academy, and he was trained himself under the same organization in a different location. He knows she was fired when a student with connections died under her training. He was fired, too, for killing the wrong person, and a mutual friend suggested he set up his new life at her school.

The two decide to teach Clay a lesson. They kidnap him, keeping their identities anonymous, and force him to confess to everything, promise never to do it again, and promise to change his character. The next day, he stops his friends from bullying the mentally-disabled girl he'd taken advantage of. At practice, Anne comes to watch and Holt tells Clay he'll help him with the video--but need Clay's help, in return, to lessen his workload. Clay, who would've begrudged this in the past, agrees immediately.

Holt and Anne are satisfied with their work. Holt asks Anne out. Anne agrees. Anne brings up a star student whose dad is hitting her, and they plan to do something about that.