In this episode of the Missing Campers Trial, Penny and Erin are joined once again by leading criminologist Dr Xanthe Mallett, and forensic psychologist Tim Watson-Munro, as they discuss the differences between killers who attack strangers and those who murder people they know. You can find Tim and Xanthe's podcast in your podcast app, it's called Motive and Method. See omnystudio.com/listener for privacy information.