One shot.

In exchange for freeing her sister’s soul from hell, Mercy Dante has agreed to work for the ruler of the Inferno… Lucifer. Now, Mercy uses the skills of her past life as an assassin to track down escaped demons from the Inferno and return them to where they belong. However, as the Age of Darkness gets closer, the Dark One approaches Lucifer to join him and his Dark Queen in their final push toward world domination. Meanwhile, Mercy finds herself sent on a mission that even she might not be prepared for.