3F

Do you think Petronella could be the murderer?

I don’t think so, purely because of Simon’s murder. Petronella may have had cause to kill Marrick, but why should she want to kill Simon? The two don’t equate for me.
If more information is forthcoming, then I’ll review the possibility.

It’s possible but too soon to tell if Petronella is the murderer.

She seems to timid to be that brutal

She has motive and quite weak alibis for her movements, but I agree that she does not seem a likely murderer and only has motive with regard to Charlie.

As I said in the earlier question I felt she had a good motive but don’t think she’s our killer.