Inferno is the fourth novel in Dan Brown's Robert Langdon series, following Angels & Demons, The Da Vinci Code, and The Lost Symbol. The novel was first published in hardcover by Doubleday in the United States on May 14, 2013, and later released in paperback by Corgi Books in the United Kingdom on May 8, 2014. The story follows Harvard symbologist Robert Langdon as he wakes up in a hospital in Florence with no memory of the past 36 hours and is thrust into a race to prevent a global catastrophe, guided by clues related to Dante's Inferno.

In Inferno, Robert Langdon awakens in a Florence hospital with amnesia and a cryptic object in his possession. He teams up with Dr. Sienna Brooks to decipher clues linked to Dante Alighieri's Inferno, leading them through a trail of art, history, and science. Their journey uncovers a plot involving a global threat, challenging them to solve puzzles before time runs out.