Earl and Terry Robertson are found brutally murdered in their home just before Thanksgiving. It it investigated whether this is a holiday robbery gone terribly wrong, or a crime committed by someone the couple knew and trusted.

Firefighters respond to a house fire and discover three gunshot victims inside. Also, authorities pursue a heavily armed murderer through Christmas.

On Christmas Eve in a quiet town, elderly couple Bob and Idella Young are brutally slain at home. A bloody glove found at the crime scene has the killer's DNA, but no one matches the sample.

On New Year's in a tiny town, Joanna and Carl Dutcher ring in the year with their grandson. Days later, they are found violently killed. The hunt for the killer leads police to a sinister group that threatens the entire community.

Two days after Christmas a mass shooting terrorises a small town, killing two people and wounding many more before the gunman is taken into custody. When police search for answers they uncover the worst family massacre in US history.

Just before Christmas, the body of a young mother is discovered strangled inside a burning car in a quiet Minneapolis suburb. Detectives suspect that she was killed by someone very close to her.