The Time Traveler's Wife, by Audrey Niffenegger, is a love story between Henry and Clare. It is an unusual love story because Henry has the ability to travel through time. Henry goes into the past and visits Clare during her childhood, meets her in present time and visits her in the future. This makes for an interesting relationship.
I really enjoyed this love story because it was so unusual. The story is told from both Clare's and Henry's point of view so you get an understanding of the person who is forever vanishing into a different time and the person who is forever waiting for him to return. This book speaks to the power of love!