Catherine MacClelland has lived with an ancient family curse her entire life. She longs for the life of a normal woman but knows she may never have it because of the "change" she goes through in times of intense emotion. She changes into the grimalkin, a beautiful but frightening golden cat, revered throughout the Highlands.
Catherine's life changes forever when she visits London with her father the Laird and meets Nicholas the Duke of Efington. The sparks fly with an instant attraction but Catherine will never risk a relationship because of her fear of discovery. The other women in her family who have possessed the curse before her have died painful deaths when discovered and are usually burned as witches. When a twist of fate forces the two to marry against their will, Nicholas and Catherine are forced to make their marriage work. Can these two passionate people overcome their insecurities and find the love they so desperately need? And can the ancient curse be broken by their newfound love?