Heather Kraft, who has lived in San Francisco's historic Haas-Lilienthal mansion for a decade as the house manager, says that people seem to want the 1886-era home at 2007 Franklin St. to be haunted. When people learn about her job, the first thing they ask is whether ghosts walk the halls. Three years ago, she started making the public's need to believe in the supernatural come true by staging a Halloween haunted house in the historic landmark. The event is unlike the other haunted houses in the Bay Area in that it mixes architectural and cultural history with a fictional narrative. It's also different from most in that many believe it is actually haunted.