Mirielle Townsend worked hard to earn her job as an archivist at the prestigious Museum of Natural History after growing up as the neglected daughter of an addict. Her only sense of family came from a grandfatherly neighbor who cared for her in her mother's absence. When tragedy strikes and Mr. Cooper disappears from his apartment, Mirielle is determined to find him, even when it puts her back on the radar of her childhood bully, who has now been promoted to detective with the NYPD.

As Mirielle examines the only clue she can find, a beast of a man named Gryphon transports her to the world of Aeternitas, a magical place where time and space meet. A prophecy has Gryphon desperately searching through history for the missing treasure to break the curse plaguing his castle. Along the way, Mirielle discovers the world as she knows it is not what it seems, and a beast like Gryphon might be more than just a monster.

When Aeternitas' enemy tries to overthrow her newfound home and friends, Mirielle joins forces with Gryphon to save them all. Her heart becomes entangled along the way, but breaking the curse is only the first step...