An orphaned Rainbow Dash grows up raised by a group of assassins, trained to kill with stealth and efficiency from the age of eight. She keeps the secret from her friends well enough, but as she grows older, and as her friends slowly move away, the desire to settle the score with the dark cloaked assassin who killed her parents peaks. But not everypony is who they say they are, and a certain white unicorn is not helping to make her thoughts clearer.