Paige Russell is nervous enough about her first day as a yoga teacher, but then something crashes her class that will put her positive worldview to the test: a twisted force locked within an ancient blade that seizes control of anyone who takes hold of it, turning them into an instrument of primal wrath. A wrath now turned on Paige when she, unexplainably, resists its dark allure. Now, with the help of Riva, a woman pursuing the KNIFE and vowing revenge, Paige will face the greatest trial of her life against an unstoppable force that can use anyone as a vessel, and will stop at nothing in its crusade of annihilation. How do you stay Zen when every single person on Earth is the potential next wielder of the unstoppable KNIFE?