Dee Wallace stars as a woman who was once tried for a murder long ago but was acquitted. Not surprisingly, she's also one of Jessica's friends...as nearly EVERY friend and family member eventually seems to be accused of murder! And, surprise, surprise, she's accused now of using arsenic to kill several folks in town! But, of course, there's some other explanation...and it all comes down to science!
While I never thought this was a great episode (plus the sheriff was WAY too grumpy to be realistic), it is different and the conclusion Jessica comes to is really original. Because of that, I do think it's well worth seeing.