After solving The Grendel Affair, the agents have another SPI File to investigate. We're Supernatural Protection & Investigations, known as SPI. We battle the real monsters of myth and legend, but this Halloween, we're searching for diamonds... A gala opening at the Metropolitan Museum of Art has attracted the upper crust of Manhattan--and thieves. A trio of vile harpies attacks the crowd and steals the stars of the exhibition: a colorful cluster...