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

Just before New Years, a hockey mom is gunned down at her front door. Later that night, seven more bodies are found in another suburban home. Police discover a shocking connection between the two crimes as they track down the killer.

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.

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.

When a mother and her two daughters fail to show up for Christmas dinner, officers enter their home and discover all three have been shot to death. The search for their killer reveals an unthinkable family nightmare.

Earl and Terry Robertson are found brutally murdered in their home just before Thanksgiving; investigating 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; authorities pursue the heavily armed murderer through Christmas.

Just before Christmas, the body of a young mother is found strangled inside a burning car in a quiet Minneapolis suburb. As detectives hunt for her killer, they become convinced she was killed by someone very close to her.