I would advise you not to bother reading the inside flap of this book, as it doesn't give a very helpful idea of what the story is about and it reveals spoilers that don't eventuate until very late in the piece. Leaving The World is narrated by Jane Howard, an English professor whose life has been characterised by being betrayed or let down by almost every significant person that she has been close to. Finally events drive her to a point where she can take no more and she makes a dramatic decision to "leave the world" by fleeing everything and everyone that she knows. But this in many ways becomes the beginning of her life rather than the end of it.
This is a long book and it takes a while to come together. For the first hundred pages or so I was interested enough to keep reading but not so gripped that I couldn't put it down. Jane was not very likeable and I also got tired of the way that every relationship she had was so dramatic, every character so unbelievably larger than life: her mother, her father, her first boyfriend, her second boyfriend, her boss, her husband, his business partner...
Having said that, as I read on I felt more and more caught up in Jane's story and I find myself liking her more and more. Douglas Kennedy has always had a talent for creating complex female characters and for communicating the misery of intense depression without getting bogged down in it. The momentum keeps building with some quite unexpected twists. I was riveted by the book's final third which I read without stopping, unable to put the book down. In many ways this book picks up pieces from all the best of Kennedy's novels - there are segments that are reminiscent of The Job, A Special Relationship, The Pursuit of Happiness and The State of the Union. It's a great read, well worth your time.