Prophet by Helen Macdonald

Your happiest memory is their deadliest weapon. This is Prophet. It knows when you were happiest. It gives life to your fondest memories and uses them to destroy you. But who has created it? And what do they want? An all-American diner appears overnight in a remote British field. It’s brightly lit, warm and inviting but it has no power, no water, no connection to the real world. It’s like a memory made flesh – a nostalgic flight of fancy. More and more objects materialise: toys, fairground rides, pets and other treasured mementos of the past. And the deaths quickly follow.Something is bringing these memories to life, then stifling innocent people with their own joy. This is a weapon like no other. But nobody knows who created it, or why. Sunil Rao seems a surprising choice of investigator.