Danger comes in pairs in this week's quartet old time radio mysteries involving identical twins and dopplegangers. First, a gangster uses a lookalike drifter to create an "Alibi for Murder" on The Mollé Mystery Theatre (originally aired on NBC on March 22, 1946). Next, a pair of twin foals leads to a plot to fix races in "The Big Gamble" from The Whistler (originally aired on CBS on October 3, 1948). Finally, we'll hear Bob Bailey in two shows. First, he's George Valentine in Hawaii investigating a case of twin sister trouble in "Journey Into Hate" from Let George Do It (originally aired on Mutual on February 21, 1949), and then he's Johnny Dollar looking for a missing heir in "The Twisted Twin Matter" (originally aired on CBS on August 21, 1960).