DC Comics Rebirth and Flash #34 Spoilers follow.
The book opens with the origin of speedster Meena Dhawan from her getting her powers to…
…seemingly dying and returning.
She was trapped in the Speed Force, but escaped to save Barry Allen. He is dying because unlike Zoome before him Barry has both the Negative Speed Force and (positive) Speed Force within him.
They do some tests on a trusting Barry Allen, but it was really to siphon his Negative Speed Force…
…as Meena becomes the Negative Flash and…
…is aligned with the Black Hole against her former love interest the Flash Barry Allen!