What book titles contain the word enemy?

Some notable book titles that contain the Word "enemy" include "The Enemy" by Charlie Higson, which is part of a young adult series about a post-apocalyptic world, and "Enemy of the State" by Vince Flynn, a political thriller featuring his character Mitch Rapp. Another example is "The Enemy" by Lee Child, part of the Jack Reacher series. These titles explore themes of conflict and adversarial relationships across various genres.