David returns as the narrator for Discover the Destroyer, after narrating the first novel in the series, Searchfor Senna. Finding Senna has not been a great problem; she tends to show up wherever the quartet of teens are going. But finding her complicates matters, because she seems to be perpetually in trouble and she is treacherous, ready to sell out anyone to get what she wants. What does she want? She has suggested that she would like to rule Everworld, but is she serious? In any case, she betrays April and continues to have a mysterious magical hold on David's emotions, "[Senna] had that power, that I knew. The power to confuse men's minds and appear to be anything," he observes. His determination to save a friend, April, from Ka Anor finally motivates him to say no to her, resulting in Senna's screaming anger...