After the Flood is set in a town hit by a devastating flood. When an unidentified man is found dead in a lift in an underground car park police assume he became trapped as the waters rose, and as the investigation unfolds PC Joanna Marshall becomes obsessed with discovering what happened to him.

How did he get in the lift and why does no one know who he is?

The floods threaten to expose secrets, and fortunes and reputations are at stake. But how far will people go to protect themselves?