Andrea Canning interviews Josh Mankiewicz about his newest episode, “Evil Walked Through the Door.” The 1983 murders of Toronto women Erin Gilmour and Susan Tice four months apart left police stumped for nearly four decades. Finally, a breakthrough in investigative techniques led detectives to a...

The separate murders of two women in Toronto ignite an investigation that spans four decades, taking detectives from the big city to a remote, northern town. Josh Mankiewicz reports.