About the book: 2011 / London. Respectable house in a prestigious area. And a “bad” apartment, which no one has entered or left for half a century. Seth, the night porter, also should not have opened the door with number 16, no matter what strange sounds penetrated outside. The young American April, who unexpectedly inherited an apartment from her grandmother, whose death is no less mysterious than her life, should not have crossed the fatal threshold. And whose diary contains a hint of a long-ago event, as terrible as it is inexplicable…