Telling you the plot kinda defeats the purpose, but here goes: The trailer documents (in the reverse order) a young girl laying dead on the ground, then being launched back up through a window. It's revealed she was thrown out the window by her Dad after she bites him, as she's become a zombie. The rest of the video shows her parents fighting them off with axes and knives in the vain attempts to save their lives, all in reverse order. It ends with the family standing and posing for a photo as they would for a holiday. The trailer and the game itself may be completely different.