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‘I know right from wrong,’ explains Garrett Clutter, 15 [pictured]. ‘It’s just that I choose to do wrong.’

Garrett is in a unit for sex offenders at endleton Juvenile Correctional Facility in Indiana.

Among the staff at Pendleton is no-nonsense but gentle and insightful counsellor Tammi Prince, and watching her at work as this two-part documentary (first shown on C4 in 2015) begins is amazing.

We also meet William McConnell, 18, a repeat offender unhappy at facing another birthday inside, and Tavarius McNair, 14, who is on the verge of a breakthrough in his counselling sessions with Tammi.

Sad and hard to watch, but not without hope.