From Wall Street Journal bestselling author Jeff Wheeler comes the heart-racing conclusion to the Invisible College series. The fate of the world hangs in the balance as two star-crossed lovers fight to beat impossible odds and secure a future together, and for humanity, or risk an all-consuming winter.

A bargain was struck beyond memory, sealed by an immortal covenant that promised either peace or extinction for humanity. The Aesir will uphold this covenant, whatever the outcome, but the Erlking will do everything in his power to ensure their victory. Two people hold the key to defeating him, but only one of them remembers who they are.

Everyone believed that Robinson Hawksley perished when the Aesir attacked the university at Nirshoye. But with memories unlocked, he now remembers the past and must await the final Awakening of the Aesir. When he revives from a magical sleep, he discovers that the Invisible College is in shambles, that those who practice magic are persecuted and put in debtor’s prison when they cannot pay the exorbitant fines leveled against sorcerers.

To end the coming calamity, Robinson must discover where the Erlking’s daughter is currently a Semblance, a doppelganger living among mortals but not knowing her true identity. It will take every creative instinct and an indefatigable purpose for the last sorcerer of the Invisible College to achieve the impossible. To thwart the Erlking himself who has finally come among mortality in a guise of his own.

There can only be one Master of the Royal Secret.