Criminal: UK

Called in one by one on a Sunday, the team risks a legal entanglement when a routine interview with a convicted killer's wife takes a provocative turn.

With scarce evidence to guide them, the investigators question an arrogant businessman accused of rape by a woman who works for him.

Asking increasingly pointed questions, the team tries to crack a zealous defense put forth by the head of an online group that unmasks sexual predators.

Confronted with a shrewd convicted killer wanting to cut a deal, the investigators gamble on calling in a disgraced former colleague to help.