LitCharts assigns a color and icon to each theme in The 5th Wave, which you can use to track the themes throughout the work.
Trust and Belief
Survival and Perseverance
Warfare and Dehumanization
Family
Summary
Analysis
On the bus as he’s leaving the refugee camp, Sammy looks out the back window, thinking goodbye to Cassie and to his teddy bear. A soldier named Parker who doesn’t look much older than Cassie takes off his mask and offers Sammy a snack. He says the bus is going to Camp Haven, where the plague doesn’t exist. He promises that while the children go first, eventually everyone can go to Camp Haven. He says the camp even has a force field, but Sammy isn’t sure if he believes those exist.
Sammy is young, and so he views the world in a much more trusting way than Cassie. While even Sammy is skeptical about whether Camp Haven has a force field around it, he accepts that Parker wants to help him because he talks kindly to Sammy and has a snack. But as Zombie’s story has shown, the pleasant exteriors at Camp Haven seem to hide something darker underneath.