I really liked the beginning of this book a lot. Two identical twins from the States move to London after inheriting all the possessions of their aunt, herself an identical twin of their mother. Her flat is right next to Highgate Cemetary, so there is much opportunity for musing upon death and encounters with ghosts. They also meet the other residents of the small apartment building where she lived and try to crack the mystery of how and why their aunt and mother cut off all communication with each other years before. 
 It was about two-thirds of the way through the book that something really goofy happened, which caused something else even goofier to happen, and so on until the entire book collapsed under its own weight. Niffenegger has said in interviews that this book started as characters in search of a plot, and to be honest, I don't think she ever found one, at least not one that really works. However, the atmosphere and characters she's created are so strong and appealing that I recommend reading the book anyway, just with reservations.