There is a killer at large in the city of Los Angeles, with no apparent motive or reason. The press dubbed him "The Sniper". He used a rifle to pick off his victims from dark alleys or upstairs windows or even automobiles. Five murders were credited to him without the police getting a clue as to his identity. Then, he started warning his victims, He'd make a phone call to someone and say, "You're next", and hang up. The police gave the warned victim protection, but the sniper knew that they could not assign a couple of cops to standing guard over a man forever. One day, while Chuck Morgan and his secretary, Carol Curtis, are discussing the day's events, the radio station phone rings. Carol answers it, and says "Chuck, its the sniper, and he wants to talk to you!" Chuck talks to him for a few seconds, then hangs up the phone. Carol asks "What did he say?" Chuck says "He only said two words...you're next".