Criminal: UK

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

With a shadowy colleague looking on, the team starts poking holes in the changing 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 everything.

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

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

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