A few decades into the twenty-first century, in their permanently flooded garden in Cornwall, Cathy and her wife Ephie give up on their vegetable patch and plant a paddy field instead. Thousands of miles away, expat Margaret is struggling to adjust to life in Kuala Lumpur, now a coastal city. In New Zealand, two teenagers marvel at the extreme storms hitting their island.

But they are not the only ones adapting to the changing climate. The starfish on Cathy's kitchen window are just the start. As all manner of sea creatures begin to leave the oceans and invade the land, the new normal becomes increasingly hard to accept.