Following on the heels of H.E.R.O. - Malice, Carey and Ironsite Security's experiment has unexpected results. A virus has been let loose on the super population, as has a mysterious energy rift near the center of Metrocity. Supers find themselves mutating further, with some powers enhanced and others reduced. The heroes become absorbed in an attempt to determine what occurred.Carey becomes a victim of her own experiment as she mutates into a super - a fire elemental. She goes through her own challenges as Ironsite Security covers their tracks. Another person arrives in Metrocity with powers outside the norm for supers. Not a super himself, Blake finds that the experiment caused a breach into the Dark Energy universe, and is able to directly manipulate the energy that gives supers their powers, but for how long? He takes a dark path in an attempt to stabilize and grow the powers at his command.The book continues the H.E.R.O. novel series with detailed viewpoints from the characters in the story as they deal with issues at a personal level while attempting to maintain some semblance of normal lives.H.E.R.O. - Dark Breach is the 13th book of the ongoing H.E.R.O. series, and is approximately 108,000 words long.