Overview
Leave the World Behind is a 2020 novel by Rumaan Alam.
Plot summary
Amanda and Clay drive out to a remote luxury Airbnb on Long Island for a vacation, along with their kids Archie, 15, and Rose, 13. They are a middle-to-upper-middle class family who live in Brooklyn. It's an idyllic and peaceful vacation until an older Black couple shows up at night, identifying themselves as the house's owners, G.H. (or George) and Ruth. They explain that there's been a blackout.
Amanda is initially suspicious of them and is surprised that they could own a home such as this one. But it turns out George and Ruth are a wealthy and highly educated couple. Their main home is in the Upper East Side of Manhattan, but they drove back to their vacation home to wait out the blackout. It's arranged that they will stay in the in-law unit in the basement until things get sorted. At the house, the wi-fi is out, along with the landline, TV and cell service. But they have power. Amanda also catches a news alert on her phone confirming a large-scale blackout across the east coast.
The next morning, Rose notices a herd of a few dozen deer outside (what she doesn't see is that there are actually thousands of them). Clay heads to town to assess the situation, but gets lost. He runs into a scared woman, but she only speaks Spanish and so he leaves her. Meanwhile, Rose and Archie go exploring in the woods. They find a shack and a house in a clearing, and Archie gets bitten by a tick. Then, a thunderous noise is heard, loud enough to crack the glass on some doors, which scares everyone. (Unknown to them, not too far away, the deer are scared and trampling everything in their wake.) Clay eventually finds his way home, but doesn't mention getting lost or the woman.
From Wikipedia (CC BY-SA 4.0).