You brought them into the world. They will take you out. A family anticipates a Christmas filled with sledding, laughter and hot cocoa as they head to their vacation home in the secluded backcountry. The holiday cheer takes a fast turn for the worse after a mysterious flu-like virus sweeps through the kids. One by one the children become deadly. Amidst the suspicion, mayhem and murder, the parents fight for survival against their own twisted offspring.