Sienna Nealon has dedicated her life to keeping those with powers from breaking the law at will. After years of filling a prison for the powered called the Cube, a Supreme Court decision opens the floodgates and lets all of them out again. Now Sienna finds herself going from hunter to hunted as the US government turns a blind eye while the former inmates target her and her friends for death. With the attacks hitting closer and closer to home, will Sienna be able to fight back against the overwhelming odds before she – or someone she cares about – gets killed?

Sienna Nealon is the most powerful person in the world. She's beaten every enemy that has ever come at her, faced threats of every conceivable kind and bested all of them. But when a new threat raises its head, one dwelling deep in the belly of the internet, she finds herself far, far out of her depth, and in need of help from an old friend in order to stop a new enemy bent on causing damage of a kind she's never before seen.

What makes a hero? For years, Sienna Nealon has worked with the U.S. government to protect the world against other people with powers beyond those of a normal human. But after several clashes with the current administration, she finds herself with a new employer, an independent agency dedicated to helping stop threats to humanity. When a new hero and villain rise in New York City, Sienna can't help but get involved, even as the U.S. government sends its own response team, led by an old friend...and a new enemy. Soon, Sienna finds herself once more against the odds, against the government, ...

Sienna Nealon has spent the last several years of her life working for the US government, policing people with powers beyond those of a normal human. Now she's come to the end of her government career, forced out by the powers that be...but not before she's called to Chicago to investigate one final murder. Then another. The deeper she gets into the investigation, the more mysteries Sienna unravels, and the more questions she's left with, until what began with a killing in an alley starts to look like a threat to the entire world...

“Guy Friday is a hemorrhoidal pain in my a-” Sienna Nealon doesn't need any complications. On the run from the law, trying to carve out as much of a life for herself as she can, the last thing she needs is the idiotic Guy Friday pounding on her door one night, wounded and begging for help. But helping people is part of who Sienna is, and soon she's embroiled in the fight against an assassin with the power to seemingly appear and disappear at will. Hunted all over the United States, Sienna must protect Friday as the two of them explore his past in order to reveal the unbelievable secret ...