When broadcaster Jaz Singh revealed on BBC reality TV show The Traitors that his father had a secret second family, he received hundreds of messages from people who had lived through similar experiences.
As Jaz movingly explores his own feelings, he meets others who have also discovered that their loved ones are leading double lives. A wife who, after years of being happily married, discovered on social media that her husband was married to another woman. A daughter whose father had an entirely separate family and children - but whose existence was only revealed after he died.
Jaz tries to understand the psychology of these second lives, asking what drives people to weave such complicated webs of deception. How do they manage to deceive so entirely? And how can those who have been betrayed forgive and heal?
Producer: Helen Clifton Executive Producer: Jo Meek Sound Design: Craig Edmondson
An Audio Always production for BBC Radio 4