The fourth book in the NuWorld series, set in a postapocalyptic Earth, a place where some technology has survived but a decimated mankind has fallen back into tribal and caste rule, with some races, the Runners, allowing women equality while the brutal Gothman are very much a male dominated warrior society with few female rights. When these two powerful warrior races were joined by marriage between Tara, leader of the Runners and Darius, leader of the Gothman, they united through treaty the two races, separately ruled, pledged to fighting alongside each other under joint command. It's this legacy that Ana and Andru will have to fit to their individual leadership styles and personalities. It's a journey toward adulthood fraught with many more than normal growing pains. This novel, like its predecessors is a powerful story of characters not driven to follow the beaten path but to follow their own way.

Do or Die continues with the lives and interactions of the twins, Ana and Andru. As the Heirs to the two most powerful forces on NuWorld, the Runners and the Gothman, they also share a special bond as twins but Ana is chaffing against the restrictions of being a female in a the male dominated Gothman world, even though she will be the leader of the powerful Runners after her mother, she is conceived by others to be easily led by her brother and now her claim.

When Ana overhears her father and Gilroy discussing the upcoming nuptial claim, she decides to take off on her own at least one last time before Gilroy and Andru will basically take over her life. On this adventure, she come across some unusual occurrences and decides to investigate further. The more time she spends with the she-witches, the more disturbed and suspicious she becomes and a chance meeting at the festival after drinking wine drugged by Lara with an aphrodisiac, finds Ana in a very compromising position. When the meeting she and Lara are headed to is interrupted by word of Gothman warriors, she knows she has been found by her brother and Gilroy, her claim, forcing her to change her plans and seek assistance as herself rather than her undercover identity.

There are many layers to leadership and this journey of self discovery is showing Ana to be much more than the easily led female her brother and father think her to be. In fact she is showing great potential to be a fine leader, albeit a much less aggressive and brutal one than her mother, father or brother display.

With a progressing pregnancy and a question of parentage, Ana must face an impending challenge to her leadership of the Runners from the very woman she had been spying on when Lara reveals her parentage. With Ana asserting herself and choosing Meah as both a first officer for her command, and potentially a "claim" for Andru, things become even more convoluted and when brutality is used to solve one problem it creates yet another one with much more serious potential.

The shocks are far from over though, and parentage will again rear its ugly head though this time it will be in battle and losing is simply not an option. The only question will be who survives and what the future will bring.

Note: The story contains scenes of, and references to, incest.

Synopsis
The worst enemy is one that can't be seen, that has no location where you can strike. And that enemy is about to attack! Ana and Andru, twin heirs to all of Gothman and the Runner clans, find themselves battling to save their inheritance and their way of life.

Their twin-bond is their strength. Except for one thing...

Bachulac An ancient Gothman tradition, outlawed for generations, sparks off a secret, illicit relationship involving Andru, Ana and Gilroy that could threaten their world.

Enter Meah, a beautiful young Runner of the Red Horn Clan. Her ability to see things others can't might be the only hope against pending attack. Her lifelong crush on Andru might have been an asset to the twin heirs, but a moment of misguided passion and the uncovering of a terrible secret rips away her innocence and destroys what might have been.

Jealousy and violent passions could once again be the downfall of the most powerful nations on Nuworld.

And the clock is ticking...

Note: Story contains scenes of and references to incest.