The Time Traveler's Wife

Carmilla is a time traveler, angry at the world for cursing her with the inability to keep herself in her present. Carrying the baggage of her past, she stumbles across someone who seems to know her better than she knows herself-- a girl named Laura, who claims she's known Carmilla for most of her life. As Carmilla moves through her future, she finds herself flung into Laura's past, with a very patient Laura always waiting for her in her present.