The Time Traveler’s Wife by Audrey Niffenegger

Clare and Henry, deeply in love, try desperately to maintain normal lives even though he has been diagnosed with Chrono-Displacement Disorder, a condition in which his genetic clock periodically resets, pulling him through time to the past or future.

Liz says:

“If you can buy into the time travel premise you will be rewarded greatly by a story filled with love, hope and hopelessness. For those from or familiar with Chicago, you will appreciate the setting. This is one of my personal favorites!”