It's 07:35 in a smart suburban housing estate in central Scotland and the police are about to turn a family's life upside down.
Three detectives in plain clothes park their unmarked car near a large detached house and knock on the front door.
They work for a specialist unit which investigates online sexual abuse, a crime which affects hundreds of children every year.
A dishevelled man suspected of sexual communication with a 13-year-old girl answers and, after a brief discussion about their search warrant, the officers go in.
What we're watching is a "soft" approach, the polar opposite of a drugs raid. No hard knock, no battering ram, no shouts of "police".
Their tactics mean the peace and quiet of the neighbourhood continues uninterrupted.
But inside the house the ripple effects of the unannounced visit are devastating.
