Criminal: UK : Episode 6

As time runs out, interrogators turn up the heat on a stone-faced doctor suspected of sexually assaulting and slaying his teenage stepdaughter.

With a shadowy colleague looking on, the team starts poking holes in the evolving story of a combative suspect accused of poisoning her brother-in-law.

The team badgers a reticent truck driver to locate an abandoned trailer full of immigrants, but a new interrogator's poor decision jeopardizes it all.

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.

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