After defeating his arch-nemesis, Captain Cold, in a thrilling battle, Flash returns to Central City to find a new villain wreaking havoc. This new foe, Deadly Nightshade, has the ability to control shadows and uses them to commit crimes under the cover of darkness.
Flash must use all of his speed and cunning to track down Deadly Nightshade before more innocent lives are put in danger. As the two speedsters clash in an epic showdown, Flash realizes that Deadly Nightshade is not just a common criminal, but a former ally who has turned to the dark side.
With the fate of Central City hanging in the balance, Flash must make a difficult decision: will he be able to save his friend and bring him back to the side of good, or will he be forced to stop Deadly Nightshade at any cost?