The actors do a very good job. Sandra is brilliant. The only problem is the plot is bogus. In real life the police would do more investigating. The cut on Katie's head? Maybe check the prints on the gun? Ruth could have explained what happened. They wouldn't prosecute a 5 year old. Ruth didn't have to do the 20 years. Maybe out of guilt she did.
Otherwise well acted good story of aspects of humanity many of don't deal with personally.