This is a novel by Audrey Niffenegger. Julia and Valentina Poole, spoiled mirror-image twins from the suburbs of Chicago uninterested in college or employment receives a letter from a London solicitor. Their Aunt Elspeth Noblin has died of cancer and left them her flat. They must live in it for a year and their parents may not enter it are stipulations of the will. They did not know Elspeth; she and her twin, their mother Edie, were estranged before they were born. The estrangement is shrouded in mystery. The twins get to know their new neighbors; Martin, intelligent crossword puzzle creator trapped in his apartment by severe OCD; and Robert, Elspeth's lover and a historian writing his thesis on Highgate Cemetery. Then there's the Cemetery itself, a character in its own right, just behind the apartment building.
This is an outright ghost story, so if you're not a fan of the paranormal this book is not for you. I wish I had had that warning; I wouldn't have wasted my time. Niffenegger hit it out of the park with her first book The Time Traveler's Wife and I guess I was expecting something on an equal footing. This wasn't even close.