Charlotte, the daughter of a powerful beta, is only certain of one thing in her life, that she is in love with her best friend. They aren't mates, but Caleb is just a driven to be together as she is. With or without the Moon Goddess's blessing, they will make their relationship work. But a strange wolf attacks her back in broad daylight, revealing that the myth of a murdering black wolf with red eyes is in fact a real threat. And Hades only has one target: Caleb. Charlotte believes that she is immersed in a living nightmare. It only gets worse when she realizes that Hades is her mate.

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.