A woman's husband with a perfect life cheats with her sister with extreme consequences befalling them all.

A newly engaged couple tries to impress their soon-to-be in-laws with a lovely Christmas Eve dinner, but finds it a difficult task to complete while hiding a body in their house.

Nell, Simon, and their son Art are ready to welcome friends and family for what promises to be a perfect Christmas gathering. Perfect except for one thing: everyone is going to die.