At the age of eighteen, everyone's blood changes colour. Whether it becomes blue, green or otherwise, the colour is either hereditary or a random, biological selection. However, when Pearl Damocles discovers that her blood is colourless - in a society where people are segregated by blood colour -, she travels to an institute for people like her with a handsome yet mysterious man named, Malik Ahmed. After months of training and planning - with a team of quirky, newfound friends and trained militants by her side - she decides begins to hatch a plan. One to bring everyone together, and abolish the inequality of the blood colours.

Humans were the species they'd been looking for. Humans would save their own race from pain. With earth long ago taken over by aliens known as the Marked People, the remaining humans have two choices. 1, become a slave or 2, hide and fight for survival. Indigo had always preferred option two but after being captured, she's having a hard time accepting her new life. Rebellion is in her blood and she's not about to stop now. Which is why she attracts the attention of a particular Marked Person. Phoenix, son to one of the Marked People's most powerful families. But Indigo doesn't want to be prey anymore, she'd prefer to hunt. After all they were the ones who turned her into an experiment and no one knows what they've unlocked in her. Indigo is only just learning how twisted the world is. With allies coming from unexpected places, her goal for freedom might not be as straightforward as she first thought.