Eighteen years ago teenager Alex sent a man to prison. She, and her two best friends from school, overheard the vicious murder of a mother and child, although only she took the stand in court.

But despite her evidence, there were always rumours that the wrong man had been imprisoned. That although he was someone not to be trusted, he wasn't a killer.

Alex has always known she did the right thing but when new DNA evidences comes to light and the conviction is overturned, the spotlight falls on her, the woman who sent him to jail. The woman whose mistake may have let the real killer evade justice for years.

And for Jonathan, Alex and Rachel, once friends for life, now strangers to one another, there are going to be many more secrets coming to light.

Because that summer, there were many different versions of the truth.