The premise was quite good (although a girl murdered in the woods is hardly a new story idea) and in the first couple of episodes it was interesting to see how the various males were suspected by their family members. Max Fowler was convincing in his role (which was however seriously undermined by a ridiculous revelation in the last episode).
As is usual with these over-consecutive-nights serials, there was a lot - and I mean a lot - of spinning out to fill the time. For example, the police knock on the door. Then we have a long drawn out scene of the occupant hesitating about opening it - for about two minutes, I'd say. Then she opens it anyway and no one minds about the pointless delay. Was this necessary to the story? Did it add excitement and tension? Nope.
The police involved themselves only minimally in the murder enquiry and as for the media circus that would descend in such cases - it wasn't there at all. Most people lived on a housing estate, but somehow, the minute they stepped out of their houses they were in the woods.
The conclusion, as already indicated, is weak. All those stones - presumably inserted to add a touch of spookiness.
Forget it.