THE TOWER TREASURE—A dying criminal confessed that his loot had been secreted “in the tower.” It remained for the Hardy Boys to clear up the mystery.
THE HOUSE ON THE CLIFF—Mr. Hardy started to investigate—and disappeared! An odd tale, with plenty of excitement.
THE SECRET OF THE OLD MILL—Counterfeit money was in circulation, and the limit was reached when Mrs. Hardy took some from a stranger. A tale full of thrills.
THE MISSING CHUMS—Two of the Hardy Boys’ chums disappear and are almost rescued by their friends when all are captured. A thrilling story of adventure.
HUNTING FOR HIDDEN GOLD—In tracing some stolen gold the trail leads the boys to an abandoned mine, and there things start to happen.
THE SHORE ROAD MYSTERY—Automobiles were disappearing most mysteriously from the Shore Road. It remained for the Hardy Boys to solve the mystery.
THE SECRET OF THE CAVES—When the boys reached the caves they came unexpectedly upon a queer old hermit.
THE MYSTERY OF CABIN ISLAND—A story of queer adventures on a rockbound island.
THE GREAT AIRPORT MYSTERY—The Hardy Boys solve the mystery of the disappearance of some valuable mail.
WHAT HAPPENED AT MIDNIGHT—The boys follow a trail that ends in a strange and exciting situation.