Tessa and Marcus went on holiday to save their marriage. Instead they nearly lost their son.  In that fatal moment of inattention a stranger stepped in.  And now Dave Jepsom is in their lives.

They owe him - they know that - but he seems to want everything. He's on the streets they walk down. He's at the office where they work. He's knocking at their front door...

And he's exposing secrets they would do anything to hide. 

If they could just go back. Not make that one terrible mistake. But it's never how it starts that matters. It's always how it ends.