The Three ??? - 199/and the Green Goblin (Vinyl Longplay 33 1/3)

A green goblin with a tinny heartbeat that haunts the corridors at night. Certainly not good advertising for a hotel and rather off-putting for guests. Unless it's Justus, Peter and Bob! The three detectives don't believe for a second that goblins really exist. Until they see the images from the surveillance camera. Doesn't what the Three Investigators discover look like a goblin after all?