Main character Thomas is a great role model, helping his friends and standing up to authority when necessary. Sexual Content Not applicable Violence Violence is on par with the source books and similar YA-based dystopian thrillers. Teens rally together to kill huge, mechanized, spider-like monsters called Grievers. Characters die from being stung or otherwise killed by the Grievers; others die after being shot or speared, and a whole roomful of adults is found dead.