I thought she stole the locks but might not make a difference.
Also wondered why the drunk guy was so sure David tenant was responsible rather than the wife as the others suggested.
Think it's going into how interconnected their relationships are. Affairs, ex's, friends and enemies. Small village with a past. Might also tie into how similar some characters look. Interchangeable.
The policeman investigating the murder is also strange.
Did he try to rescue the kids first? I missed that bit. Surely he knew the house well enough.
How long ago was the car accident? On the daughters 5th birthday.