The Kid and Stripesy must hunt down the building stone that was once a part of a prison, later used in the Belford Building. The Barracuda sends out a robot, at the same time, to retrieve the stone, and when the Kid discovers the stone was hollow and once used to smuggle in objects into the prison, he substitutes a false one in the robot's chest.; The Knight is on the trail in Transparent City of the famed poisoned cup once belonging to the Borgias, but Silver Dollar Dan and his boys beat him to it, but are caught by the very trap they set for the police!; Rubber baron J. Edwards is mysteriously killed at his plantation and the police are puzzled by the lack of a murder weapon. The Vigilante must beat Big House Bennie to the plantation to discover the location of that weapon and retrieve it first.; The Crimson and Wing in disguise go undercover on a ship, waiting for the Barracuda to show his hand, and then discover the part of the ship the master criminal really wants: a part of the main sail.; Green Arrow discovers that a radio factory worker has bought the iron ring they seek, and that man discovers that the ring carries voices and was once used by a mobster as a way of keeping in contact with his gang.; The Law's Legionnaires have donated some unusual items to a local museum: a building block, a rubber dagger, an iron ring, a cup, and a piece of canvas, items that a master criminal, the Barracuda, once wished to have for his own private Museum of Crime (knowing they have a value unknown to the authorities), and which are being tracked down by the Legionnaires before the criminal can get his hands on them.; Having secured all the items, the Legionnaires turn them over to a local museum, where the Barracuda and his men are waiting to grab them.