Invisible aliens stalk Chicago, possessing the strength of a hurricane, an interest in lead and electronic components... and a thirst for bone marrow.

When Tony receives a surprise visit from the New York auditors, he sends Carl in his place to do a story on the last voyage of the ocean liner Hanover. However, a series of vicious deaths soon convince Carl that a werewolf is loose on the ship... and only the captain's silver buttons, melted into buckshot, can stop it.