The DSM-V is the American Psychiatric Association's "bible," featuring a plethora of mental illnesses. Odds are you have at least one. We're not sure if the DSM-V exists in Delirium, but if it did, it would only be one page long. And that page would have on it: amor deliria nervosa (love). To the government in Lena's world, love is the cause of all our problems. Supposedly, it can be cured. But the brain, like love, is complicated, and the cure isn't foolproof. Plus, people have to wait until 18 to be cured anyway. So if love makes you crazy, well, everyone in Lena's world has been crazy at one point or another. At least all this madness makes Delirium a fun and interesting read.