but this stieg larsson story is real. the author died before his novel became an international best seller. but is bad blood keeping his lover from his millions? >>> and, hell on earth. unbearable heat, drownings and air so thick with smoke, you need a gas mask to breathe. an extraordinary dispatch from apocalypse now. >> announcer: from the global resources of abc news, with martin bashir and cynthia mcfadden in new york city, and terry moran in washington, this is "nightline," august 6th, terry moran in washington, this is "nightline," august 6th, 2010. >> good evening, i'm terry moran. and we're going to begin tonight with a rag tag band of amateur adventurers that love nothing better than a vacation mired by rain, giant hailstones, especially a tornado. while everyone runs away from the storm, they run to it. thrill seekers looking for that next rush, and an up close look at the destructive beauty of mother nature. eric horng reports. ah, vacation. we all have our favorite memories. like that relaxing week at the beac