After she is framed for the murder of her fiancé, Zahara Jeri is given a chance by her would-be father-in-law to prove her innocence and find the real criminal. She suspects the criminal is one of the man's children, her fiancé's half-siblings. Because she has no evidence, she has to try and force out a confession. And she has to do it in 24 hours.

Aurora has spent the last 20 months of her life confined to a nuclear fallout shelter. Alongside five other survivors, she's managed to eke out survival, their supplies lasting only due to the tragic loss of the rest of their group. After receiving a radio transmission from a distant shelter offering a new location to stay, the group is forced to embark on a dangerous journey. Upon arriving at the destination, Aurora finds her group to be more in need of rescue than ever before.