If you could find out when you'll die - WOULD you? Learning her expiry date doesn’t sound like much of a birthday present to Rae, but it’s been that way for everyone since the Cryptograph was introduced. A biological algorithm developed by Silicon Valley, it can determine with precise accuracy the lifespan of every human being on the planet. Everyone gets tested when they come of age, but Rae wants to opt out. She hates how the system labels and categorizes society according to longevity - like Transients, whose short lifespan automatically renders them useless, Interims, the hard-working majority - or elite Constants, whose long lives guarantee opportunity and power. But when Rae’s intentions to avoid the test are impeded and her lifespan is revealed, the future seems set in stone. Or does it...?