Across the two episodes, Sir Trevor speaks to a mother who killed her three-month-old child, a fugitive who was on the run for over 30 years before she was caught and a woman who is in solitary confinement whilst having to cope with being five months pregnant.
He also meets a double murderer whose skill at manipulating people enabled her to break out of prison - she then became America's Most Wanted Woman.
Trevor also visits a segregation unit where inmates must be locked down for 23 hours a day, shackled and escorted for showers and speaks to an offender who entered prison as a teenager and has been in jail for 38 years. She will never be released.
Many look like angels, but this belies an often volatile and complex offender population.