Retired history professor Abe Aronson is a cranky, solitary man living out his autumn years on Gardner Island, a ferry ride away from the hustle and bustle of nearby Seattle. One rainy February night, while dining at a favorite local haunt, Abe and his girlfriend Joanna meet an engaging enigmatic waitress, new in town and without a place of her own. Fascinated and moved by the girl's plight, Joanna invites her to stay in Abe's garage. It seems everyone falls for the charming and invigorating the waitress, but she is much more than she appears, and an ancient covenant made a millennium ago threatens to disrupt the spring and alter the lives of Abe, Joanna, and all those around them forever...