After spending the night together on the eve of their college graduation, Dexter and Emma are shown each year on the same date to see where they are in their lives. They are sometimes together, and sometimes not.
A family's getaway to a luxurious rental home takes an ominous turn when a cyberattack knocks out their devices, and two strangers appear at their door.
Hotel guests find themselves isolated when a snowstorm rages furiously. Two of them die in mysterious circumstances. On vacation there, Captain Horak takes the case in hands but things start to get out of control.