Michelle DePalma arrives at her mother’s home to find that the door is uncharacteristically wide open. Upon entering, she finds a young woman dead on the floor with her mother hovering nearby—seemingly unaware of what has taken place in the foyer of her home.

As Marchisello weaves her intricate tale, the doorway introduces:

• Unknown family: “I’m Isabella Rogers, and this is my daughter, Giovanna. I’m your daughter-in-law.”
• A policeman: “Michelle, I’m afraid the evidence is pointing to your mother.”
• A man with a raised baseball bat: “Where’s that crazy old broad that killed my Brittany?”
• A potential suspect who appears in: “The same vehicle I had passed on my way up the street the day I arrived, the day Brittany had died!”

Going…