A Siamese twin kills the husband who left her. The courts have to decide if she is convicted of murder, how can they punish her sister, who had nothing to do with the crime?

Two federal agents battle a gang that hijacks trucks carrying materials vital for the security of the country and sells them to foreign powers.

Reporter Patsy Reynolds and photographer Eddie Porter are assigned to interview John Foster, head of the Emmerson Foundation regarding a listening device the organization is working on. Foster evades them and they to the lab to see Professor Reynolds, the real inventor. Soon, they are involved in several shootings, blueprints that change hands several times, a corpse in their car that appears and disappears a few times, the loss of their jobs and several people who either think they are killers or candidates for being killed.