Sebastian is a wolf shifter and one of Santa's elite Yuletide Guardians, sworn to protect Northernmost and the Well of Magic. He knows Jack Frost is a constant threat—but he never expected to find his truemate running for her life from the dangerous male.

Phoenix witch Emberlin traveled to Northernmost with her sister to replenish their magic, but their portal spell went horribly wrong. Stranded near Frost's lair, Emberlin barely escapes while her sister is captured—and stripped of her magic.

After Frost attempts to use her sister to weaken the Well's magical defenses, Emberlin finds herself battling Frost with her mate and the Guardians. When Sebastian's life is on the line, will Emberlin risk everything to save him—even if it means letting Frost escape? Or will her thirst for vengeance cost her the mate she was destined to love?