"We spend most of our lives wishing we were somewhere else or different, waiting for something, or ruminating on the past. We always imagine that the grass is greener on the other side. But it's never greener. It's always grass, just another piece . That is all."

The habit of the past is to track us down and hook us.

At the age of twenty-two, Kate had a passionate affair with a married man, Callum, which ended in heartbreak. She felt she would never get over it.

Seventeen years later, Kate is a successful actress, lives in London, is married, and the mother of five-year-old Tallulah. Callum lives happily in Edinburgh with his wife and grown children. They all seem to have put the past behind them for good.

But Kate and Callum are reunited and faced with a choice. They give up on each other or take the risk to find out what would have been...