Fear Street #10: Ski Weekend book by R.L. Stine 

"Red" Porter was a stranger they'd met on their ski weekend. But Ariel Munroe, Doug Mahr and his girlfriend Shannon Harper were grateful he was there when they set out for home on the icy roads. Thank heaven for Red! He spotted the hilltop lodge when they were stranded by the blizzard. He took charge when they stumbled into strange surroundings, scared, tired and looking for refuge. But can he save then when their refuge becomes a trap? Suddenly, their hosts are acting very sinisterly. Doug's car is gone. The phones are dead. And the house is full of guns. If they steal one, maybe they can escape! Until a shot is fired and the real terror begins...