The Flash is captured and forced to breathe in the by-product of hard water gasses so that he loses his speed. His place is then to be taken by a mysterious masked Flash with criminal tendencies.; A criminologist and professor at State College are working together on an unsolved murder mystery, and the nephew uncovers some new angles on the case, but is murdered. Black Canary and Larry then uncover a twist in that old case that nearly costs them their lives.; Hawkman discovers that a band of crooks is attempting to obtain top secret scientific information from the custodian of the science club to which Carter Hall belongs.