Why did two families get murdered, with one member of each being left alive?
That was addressed on Criminal Minds Season 12 Episode 5 when the team were shocked to the core by both crime scenes.
The team split up to find links between both crime scenes, but they were presented with a huge shock when they brainstormed the idea of the survivors being tormented by bullies.
Use the video above to watch Criminal Minds online to get up to speed with the latest developments for the team as they try crack the case.
Paul Dailly is a staff writer for TV Fanatic. Follow him on Twitter.