HARDY BOYS (Lot of 6 Novels). Included in this lot are the following novels: #2- the House on the Cliff; #10- What Happened at Midnight; #31- the Secret of Wildcat Swamp; #44- the Haunted Fort; #48- the Arctic Patrol Mystery; & #50- Danger on Vampire Trail. All volumes are in good condition and completely intact.  Thanks for looking.