Cassie is alone, living in a forest, afraid to trust anyone. Not that she sees many people of course. Almost everyone is dead. Seven billion humans on earth and less than a few thousand left. She's trying to survive and at the same time find a way to get her baby brother back. Just like she promised him before he was taken.
When she finally decides to leave the forest, she gets shot on the highway by a Silencer - the 4th wave. she gets die from the leg wound. She passes out and wakes up in a house. A very good looking young man had saved her. She grows to love this man - Evan. He loves her too. Cassie can't bring herself to trust him... she tells Evan that she has to rescue her brother. He tries to keep her there with him. Doesn't work. Soon they go together to find her little brother. In which time she discovers that Evan is an alien. One of the 'others'.
Ben Parish survives the 3rd wave, barely. Now he's being trained to what he thinks are the aliens... but he and Ringer find out the truth and it messes with his head. Ringer says they should all just run away but Ben made a promise to a young boy in boot camp. He has to go back to the alien lair for the kid. He won't leave him behind like he left his younger sister.
That's where Ben runs into Cassie, she's already gotten into the boot camp and got her brother. Cassie is stunned to see her old crush. She'd spent so many times before the arrival daydreaming of him. With the help of Evan and later Ringer, they make it out of the alien fort. With nothing much left behind...
I was hooked from the first page of this book. Cassie just has this voice that made me want to see what she said next, what her plan was. I also felt so sad for her, not being able to trust anyone. How was she to know if they were alien or human? I love the slow building relationship between her and Evan. I really hope he lives as I really like Evan. For an alien he's pretty awesome. You can see how much he loves her. It's so sweet.
The writing was very forward, and flowed together nicely. I found myself unable to put the book down. I read it all in one day.