One day They come. All it takes is one night and most of humanity is wiped out. Amy has come to acknowledge the fact that her parents are gone. She has survived mainly because her mom, who worked for the government, had an electrical fence put around the house. This has kept Them at bay. They have good hearing and any sound brings them running. Amy walks around barefoot or with socks as not to make any noise. She has gotten food by raiding houses around her and making trips down the block to the convenience store. On one of these trips she comes across a toddler left behind in the store. Amy takes her back home and calls her Baby. For three years it is just Amy and Baby. Amy teaches Baby sign language and this is how they communicate to not make any noise. Amy also teaches Baby how to be quiet when they go looking for food. On a trip to gather food and clothing they come across Amber, who has been left behind by her brother and his gang. Amber comes home with Amy and Baby. Amber stays with them and Amy teaches her how she and Baby communicate and to be quite so They don't come. On one of their trips to a neighbors house to get clothes Amber finds a Prada bag in a closet. She squeals and that brings Them to the house. They think they are done for when a black helicopter comes and captures one of Them. Amy, Baby, and Amber are able to escape and make it back home. Amy tells Baby that Amber has to go, but Baby doesn't want her to. The next morning Amber is gone. Shortly after Amber leaves a group of men come looking at the electrical fence outside the house. When Amy suspects they are connected to Amber she tells Baby to get things ready in case they have to go. When the fence goes down Amber and Baby run away. They make it to a nearby lake and as they are bathing the black helicopter comes and takes them away. They are taken to a government facility, which used to be a college. It is run by Amy's mom, who she thought was dead. Amy finds it a bit hard to live with other people when it's just been her and Baby for the last three years. She starts poking around and finds out the truth behind the They. She is put in The Ward and is given drugs to make her forget what she knows.
I really liked this book. It is a good story about doing what you need to do to survive, especially when the enemy can hear really well. I liked how Amy was resistant and kept on trying to get information about what goes on in the building. She knew something wasn't right and her mom was hiding things from her. I liked the way the book ended. Even though most of the human race was killed, what remains of humanity still fights and lives on.