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Assistant District Attorney Roger Phillips, various reporters and other officials, gather at a prison to witness the execution of convicted killer Nick Ross. Before being strapped to the electric chair, Ross makes his first public confession, and says he has been protecting the identity of the man who ordered the killing. As his boss has reneged on his promise to free Ross, Ross intends to identify him, but suddenly dies when he is hit by a poisoned dart. Roger searches everyone in the room for the murder weapon, then has everyone return to the same seats in which they sat before Ross's murder. Roger becomes suspicious of an elderly man named Lanning, Ross's character witness, because he has a cigarette holder which could be used as a dart blower. Lanning proclaims his innocence but is arrested. Reporter Geri Reynolds, meanwhile, is sent to the prison, and Roger, her boyfriend, asks her to get acquainted with Lowell King, a parole board appointee. After Roger is reprimanded for arresting Lanning, whom he admits is an unlikely suspect, he asks Geri to interview Ross's girl friend, Verne Drake. Verne defends her former boyfriend, but admits that he made a phone call from her apartment on the day of the murder. Verne only remembers part of the number, and shortly after Geri leaves, Verne gets a threatening phone call. Roger sends police detective Collins to watch Verne, and recognizes the telephone number as King's. Roger is then mystified by a code written on the back of King's business card, and asks Tommy, a switchboard operator who wants to be a detective, to decipher it. Although Roger questions King and he denies knowing Ross, his butler, Gordon, admits to having placed bets with Ross. Verne, meanwhile, plans to leave town and demands that J. Reed, the head of an organization which opposes capital punishment, return the money she gave him to obtain Ross's release. Reed, who was at the execution, accompanies Verne to the bank, but she dies suddenly after honking the car horn. Collins catches Reed when he runs, and Roger later discovers a poisoned dart embedded in the steering wheel that matches the one that killed Ross. Roger arrests Reed and frees Lanning. One evening, Geri and Bates, a fellow reporter, dine at Garrick's café, where Geri's check is refused. King comes in shortly after and, because he is friendly with Garrick, offers to help. A waiter accepts King's check and takes it to Garrick's office. Garrick burns King's check, and gives the waiter a roll of money. King then gives the money to Geri, but still pays her bill. Later, while waiting for Roger at his office, Geri realizes that the code on King's business card is for a library book. As Tommy is asking the investigative department to find out about the book, Geri accidentally drops her purse. Geri and Tommy are shocked to discover five $500 bills in her wallet, sandwiched between two one-dollar bills. When Roger returns, Tommy tells him what transpired. King becomes Roger's new suspect after he learns that a library book on toxicology was checked out by Gordon. Tommy arranges for Roger and Bates to listen in on a telephone conversation between Garrick and King, who are partners in a protection racket, during which they hear that Garrick believed the money was intended for King. At that moment, King reveals that Geri is with him, and Roger, Bates and Collins rush to his house. Roger bursts into King's office just as he is about to kill Geri with a poisoned dart. King confesses to the murders of both Ross and Verne, then tries to kill Roger. However, Geri knocks King out with a vase, and Bates and Collins capture Garrick and his thugs. Roger and Geri embrace, and Roger asks her to join his staff permanently.