Mabel brings her new friends (and an old one) to her childhood home to meet her mother. Meanwhile, Detective Williams starts to have her own doubts about the case as…

With the investigation scratching at a web of old crimes originating inside the building, a mysterious young man turns the tables to spy on Charles, Oliver & Mabel.

The group begins researching the victim. Meanwhile, Mabel’s secretive past starts to be unraveled.