What book does Robert Langdon think about in inferno when ...?
There is a moment when Langdon just finds out Sienna is bold and then they talk about how freezable it would be if something would happen to kill a lot of people - it would safe humanity. This reminds Landon of a Novel (from the 19th century ??) where people at the age of 20, volunteer yo die in order to safe the human race. and Langdon remembers that the novel was adapted into a movie but that the death age was raised to 30 in order to not put off 20 year olds from seeing it.
Doers anyone remember the title of the novel?