Shelby is about to quit her job as a rocket engineer when her daughter becomes convinced that her Scrooge-like boss, Evan, is the Christmas Prince from a story Shelby invented years ago.

After learning that their younger sibling escaped an earlier kidnapping attempt that also killed their parents, two estranged sisters must join forces to rescue her from a group of bloodthirsty vampires. Out for revenge and control of a vampirism vaccine, Thorn and his band of the undead soon learn that they messed with the wrong family.