The golden age of radio meets the atomic age with these four mysteries. First, Bulldog Drummond hunts for missing radium in "Claim Check for Death" (originally aired on Mutual on January 17, 1947). Next, villains plot to wipe out New York with an atomic weapon, and only Mr. I.A. Moto can stop them in "A Force Called X07" (originally aired on NBC on May 20, 1951). The feds try to find the man who's smuggling out secrets of a new atomic bomb in "The Case for Dr. Singer" from Suspense (originally aired on CBS on June 28, 1951). And undercover agent Matt Cvetic has to thwart a Red plan to wiretap an atomic scientist in "The Line is Busy" in I Was a Communist for the FBI. Note: Unfortunately the intro to this week's show was lost due to a technical issue!