16-year-old Megan Walsh has nothing to do with young people of her age. She didn't shirk school with girlfriends, didn't go out on dates with boys, never in life was in a disco. She did not have all this for one reason: Megan is special agent, whose preparation began since childhood. She wants to be normal, but is not possible within the walls of its elite educational institution, so Megan decided to escape. She fakes his own death and enters the suburban high school. Her new mission is to become a normal schoolgirl. The added complication is that Victoria, a former student, or No. 1 and current archenemy, send another teenager Heather with the purpose to seize Megan. Very soon supergirl understand that it is more dangerous in the school than in the most complex special op.