Humans are creatures with morals, with true sentience. Unlike animals, who only act to survive- their blood an obscene ruby shade- humans are born with milk white blood. As they turn against they're conscience, humans blood turns darker. Most adults have pale shades of grey. Hardened criminals carry their sins in the deep black of their blood. Newly widowed Ailbhe Richardson nee O'Shea, is arrested under suspicion of her husbands murder. They test her blood, only to find it milk white in her innocence. Ailbhe is shocked, as she was indeed guilty of the murder. With her newly discovered eternally white blood hiding her crimes, follow Ailbhe as she becomes one of the most effective assassins the world has ever encountered.