Poor really, was expecting better. Doesn't seem like there was any consultation with real investigators/police or advanced interviewers. I only managed to force myself to watch the first two episodes. The technicalities are wrong, no legal caution, unrealistic solicitors and no interview room looks like that. This list goes on. I really don't know why this series is highly rated, the acting isn't great, the stories are weak with no build up and none of the main characters have their own story lines.