Operation Untouchables

Meet Keith. A small town girl, with a huge and dangerous secret. She and two of her friends are time travelers. But apparently, they aren't the only ones.
After kidnapped by the military, they are given a mission. Someones been going through and messing up the time lines. And it's up to Keith and her sidekicks, Bethany and Reid, to save the world.
They have have to take down the mischievous enemy, before it goes far enough back in time, to destroy the world.