London. A respectable house in a prestigious district. And “an unkind” apartment that, for already half a century, no one has entered and from which no one has ever left.
Seth, the night porter, also shouldn’t have opened the door of number 16—no matter what strange sounds were seeping out.
Nor should a young American woman, April, have crossed that fateful threshold—she had unexpectedly received the apartment as an inheritance from her grandmother, whose death was no less mysterious than her life. And whose diary contains a hint of a long-ago incident—just as terrifying as it is inexplicable…