The Time Traveller's Wife - Audrey Niffenegger

Henry has a genetic disorder that makes him travel through time, mostly to the past, but occasionally to the future. His life is cyclical. He meets himself at all different ages, from all ages. He can never change anything that happens in the past even though he knows the outcome. Henry often visits his wife, Claire, when he is older and she is a child, so that when they meet in the present, she knows him and knows that they will marry, but he has never seen her before. The story is told basically chronologically through both Henry and Claire's perspectives. Pay attention to the dates and ages at the beginning of the chapters - I usually don't in books, but here it really helps you understand what is happening and who is speaking. This book is a wonderful read - one of those books that you want to read again as soon as you're finished it. Being both joyful and sad, this is a most enjoyable, impressive first novel from Niffenegger.
Read it.