This story revolves around the relationship of a young, shy boy named Colin and a popular though troubled boy, Roy. Colin, the typical shy geeky character found in so many novels (a young boy who prefers reading to sports, comic books to approaching a girl, etc.) has been moved from city to city and thus has no friends until Roy. Colin, unable to believe his luck in befriending an athletic, popular boy such as Roy, is willing to maintain their friendship at all costs.
Enter Roy, a boy with two faces – the polite one who would rush to carry grocery bags for an old lady, and the other one, who would torture a cat with sheer delight. Only Colin knew of this other, budding young serial killer, while the other served as the popular character the community loved. However as Colin became more and more intimate with this second, less desirable Roy, his life spirals out of control. Together they begin to plan a murder – Roy with glee, and Colin with skepticism, until Colin realizes that it is something more. Colin, in an effort to seek help, realizes that his friends aside from Roy are nil – even where his family is concerned. In addition, Roy now sees Colin as a mortal enemy, betraying him as another had once done. It soon becomes revealed that the last friend Roy saw as betraying him was burned alive. Colin realizes how serious Roy is now.
As a young boy Colin now sees his life in danger on a daily basis. Without the help of any adults he realizes that he must win this battle against Roy alone, and success becomes of life or death importance.
In The Voice of the Night Koontz is able to weave a tale worthy of holding the readers attention. While the character Colin is a classic fiction subject – geeky, inexperienced with girls, not the least bit athletic, and even the surface Roy is a classic character – popular, athletic, and attractive; Koontz is able to breathe life into characters that readers have seen time and again in practically every genre. To see Koontz weave this underlying personality in Roy, this sinister, reckless, inhumane boy-next-door, is indeed a treat. However the treat ends there. While the story indeed moves at a desirable pace, with all of the action that the paper jacket promises, Koontz makes a very Koontz-like mistake. The ending, like the ending in many of his other books, seems to be a patchwork job where he makes sure that everything turns out alright. The reader begins to feel as if all of their worry about the fate of Colin (or Roy for that matter) was for nothing. As with many Koontz books, the story line gets thumbs up, while the ending gets a shrug.