As a young adult, Catherine Chandler witnessed the murder of her mother. She would've been killed too, but someone -- or something -- saved her. Now a police officer, Cat's investigation of a case leads her to the person who saved her: a doctor named Vincent Keller.
Vincent has been in hiding to guard his secret -- when enraged, he becomes a terrifying beast, unable to control his super-strength. Catherine and Vincent find themselves powerfully drawn to each other, yet understand their connection could prove extremely dangerous to them both.