The stranger you know

He meets women. He gains their trust. He kills them. That's all Maeve Kerrigan knows about the man she is hunting.

Three women have been strangled in their homes by the same sadistic killer.

With no sign of a break-in, every indication shows that they let in their attacker.

But the evidence is pointing at a shocking suspect: DCI Josh Derwent, Maeve's colleague.

Maeve refuses to believe he could be involved, but how well does she really know her partner?

After all, this is hardly the first time Derwent's been accused of murder...