Danger on Vampire Trail is the fifty volume in the original The Hardy Boys series of mystery books for children and teens published by Grosset & Dunlap.
This book was written for the Stratemeyer Syndicate by Andrew E. Svenson and first published in 1971.
Plot summary
The Hardy boys and two friends Chet and Biff take a camping trip to the Rocky Mountains in an attempt to locate a gang of credit card counterfeiters.