What if a virus rendered the entire population of earth simultaneously immortal and sterile except for a single small town (that have barely enough population to be genetically viable for continuing the species)?
Things that could happen include:
dying made illegal
forced breeding camps
small town suddenly a major political power
children becoming a prized resource and kidnapped, etc by other countries
pressure on non-breeding couples in town
effects of immortality on politics, economy, property law, etc.
elitism and self-preservation and the conflict between immortals and mortals.
discovering cause of virus (terrorism/accident/aliens/god/whatever) and why.
why was this one town immune? Can a cure be found from studying them and is a cure even desired?