If your son was on trial for murder, what would you do?

Andy Barber's job is to put killers behind bars. And when a boy from his son Jacob's school is found stabbed to death, Andy is doubly determined to find and prosecute the perpetrator.

Until a crucial piece of evidence turns up linking Jacob to the murder. And suddenly Andy and his wife find their son accused of being a cold-blooded killer.

In the face of every parent's worst nightmare, they will do anything to defend their child. Because, deep down, they know him better than anyone.

Don't they?