As Harley settles into the new dynamics of her life, including a budding relationship with Onyx, she's ready to move forward on her plans against the Order. Now more comfortable with her magic, she's optimistic about using it to her advantage and taking them down.
However, her plans are thwarted as Mark resurfaces with a vendetta; Harley's only warning coming from an unlikely ally. Meanwhile, Bethany is also out for revenge, making an appearance of her own. Bethany has nothing left to lose and nowhere else to direct her anger.
The odds of surviving them both aren't in Harley's favor.