In a world of people with powers, Sienna Nealon has long been the one who maintained the order. But now she finds herself on the other end of the law, cast out and abandoned by her friends. On the run, hunted by relentless and implacable foes, she will face her greatest challenge – an enemy who holds a seat of power so great that even Sienna may not be able to stand up to him.

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?

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, ...

Exiled from her home, Sienna Nealon finds herself among the windswept fields of Scotland, stalking a dangerous murderer who has more in common with her than any other foe she's ever faced. But when the killer changes the game, Sienna will be forced to into a contest with a quarry more canny than she's been tested against before - and led into a confrontation that will change her life forever.

“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 ...