Delirium is a dystopian young adult romance novel written by Lauren Oliver, published in 2011 by HarperCollins under its HarperTeen division.

Conversely, Hana is rebellious, goes to underground parties after curfew, and listens to music that is banned by the DFA.

However, only months before her scheduled procedure, Lena falls in love with an Invalid (a person who has not taken the Cure and lives in the Wilds), Alex.

She had recently read a Gabriel García Márquez essay that stated all books were about either love or death.

At the gym, she was watching a news report about a pandemic, and the two ideas combined in her head to form the central concept of the Delirium books.

The references to The Book of Shhh and The Safety, Health and Happiness Handbook, 12th edition, are exquisitely artful touches.

A book including it was released as Delirium Stories: Hana, Annabel, Raven, & Alex.

[4] According to The Hollywood Reporter actress Emma Roberts was cast as Lena Haloway in the main role.

On February 25, 2013 Daren Kagasoff was cast as Alex Sheathes, the male lead and Lena's love interest.

Karyn Usher penned the pilot, with Peter Chernin and Katherine Pope as executive producers.