The time traveler‘s wife by Audrey Niffenegger

Henry DeTamble is a dashing, adventurous librarian who is at the mercy of his random time time-traveling abilities. Clare Abshire is an artist whose life moves through a natural sequential course. This is the celebrated and timeless tale of their love. Henry and Clare's passionate affair is built and endures across a sea of time and captures them in an impossibly romantic trap that tests the strength of fate and basks in the bonds of love.