Sub-Genre: Mysteries & Detective Stories
Publisher: Grosset & Dunlap
Street Date: January 1, 1971
Item Number (DPCI): 247-02-5710
Origin: Made in the USA or Imported
An assignment form their famous detective father to track down a ring of credit-card counterfeiters takes Frank and Joe Hardy on an exciting camping trip to the Rocky Mountains. But the cross-country trek with their pals Chet Morton and Biff Hooper is jinxed from the very first day. Strange happenings on a nearly impassable mountain lure Frank, Joe, Chet, and Biff to almost certain death before they discover the sinister reason for the danger on Vampire Trail.