After a vampire leaves his native Balkans, he murders a Czech artist, assumes his identity, and moves in with the dead man's American cousins.

Carol Dahlmann enlists the Hollister brothers to help locate her missing husband. The husband was tracking a fallen satellite through the jungle. While tracking him down, the trio discover an unusually strong acid killing animals and people.

Giants Mollusks are released from the earth by an earthquake and start killing people.