Demons charm, tempt and manipulate on a global scale as they wage a covert war on Earth for human souls. The Curia has been fighting them for centuries, training an elite group of demon hunters in partnership with the angelic ambassador to Earth. Tessa Sinclair, a US Army veteran, has been newly recruited to be a hunter. Haunted by her past, she is on a self-destructive path, numbing her feelings with whiskey and one-night stands. As Tessa trains to become a hunter, she grows suspicious of the organization. Befriending a recruit who doesn’t believe in the supernatural realm, the two discover a possible conspiracy that could shake the foundations of our modern-day understanding of religion and science. From the streets of Paris to the nightclubs of Scandinavia, Tessa and her fellow hunters face off against a savage enemy, whose true purpose remains shrouded in secrecy.