Since Luna's return some of Equestria's rival nations have felt threatened by the extra goddess now ruling along side Celestia. Many of them don't respect her or even listen to what she says and a few have even chosen to remove her from power, whether through political machination or assassination. This newest assassin though, he is different and the longer he stays and the more he tries to end Luna the more Luna discovers about him. For the assassin Luna presents something to him he has never encountered before and it causes something in him to change the more times he tries.