Did vampires roam the earth in the time of Michelangelo and Leonardo da Vinci? Historical records indicate that people thought so and even describe how to safely bury them. Now, more than 400 years later, a 16th-century mass grave is unearthed near Venice that includes a skeleton with a brick apparently inserted between the jaws of the skull. This appears to be evidence of a macabre ritual designed to "kill" a vampire and sparks a highly unusual forensic investigation.