The Time Traveler's Wife by Audrey Niffenegger
Synopsis:
Audrey Niffenegger's innovative debut, The Time Traveler's Wife, is the story of Clare, a beautiful art student, and Henry, an adventuresome librarian, who have known each other since Clare was six and Henry was thirty-six, and were married when Clare was twenty-three and Henry thirty-one. Impossible but true, because Henry finds himself periodically displaced in time, pulled to moments of emotional gravity from his life, past and future. His disappearances are spontaneous, his experiences unpredictable, alternately harrowing and amusing.
The Time Traveler