Students on summer break are exposed to a deadly virus that is spread rapidly through direct human contact. The infected become enslaved by the invading "swarm" intelligence and driven by an insatiable appetite to consume human flesh. Returning home, the students spread the infection to their fellow classmates and other unsuspecting townspeople.

The year is 1799 Romania. The Gypsy people on the verge of having their lands taken over by bloodthirsty rulers known as "The Order" An officer of the Order "Captain" finds his way into a twist of fate and his bloodthirsty companions.

When his brother goes missing on a remote hiking trail, Jack Rollings goes in search of him but soon finds himself in a dangerous game of cat and mouse with a creature thought only to be that of legend.