A fateful lecture. A gruesome murder. A hidden portal. As Carly Stuart jumps head-over-boots back into the world of secret societies, high technology, and deep magic, she must risk her life and race against her enemies-and time itself-to get the Grail. Barely three months after escaping the horrors at GE Pharmaceuticals, Carly Stuart must choose between burying the past or unearthing its secrets. Haunted by the abduction of her boyfriend and his brother, but lacking evidence to bring Dr. Gellmane and Dr. Pritzmord to justice, Carly grapples with grief, loss, and regret.

When her mother gives her an ultimatum, she reluctantly returns to Nassauton College, walking away from the Knights of the Dagger and leaving the past behind. But her destiny isn't done with her yet. Armed with new information, better direction, and the Knights of the Dagger's full backing, Carly sets off for Teotihuacan. There, she discovers Dr. Gellmane's wicked intentions to weaponize the Grail and destroy the balance among Earth-and all realms-forever. But as Carly learns the truth about herself, her family, and her future, is she brave enough to stop Dr. Gellmane once and for all?.