The Time Traveler’s Wife by Audrey Niffenegger. Huge bestseller in the early 00s. From Amazon: "A dazzling novel in the most untraditional fashion, this is the remarkable story of Henry DeTamble, a dashing, adventuresome librarian who travels involuntarily through time, and Clare Abshire, an artist whose life takes a natural sequential course. Henry and Clare's passionate love affair endures across a sea of time and captures the two lovers in an impossibly romantic trap, and it is Audrey Niffenegger's cinematic storytelling that makes the novel's unconventional chronology so vibrantly triumphant." They made a movie out of it with Rachel McAdams.
