Colonel Pete Moore (Glenn Ford) is commander of the Whitney Radar Test Group, which has been experiencing electrical difficulties aboard its aircraft. To ferret out the problem, he sends a four-man crew on Flight 412. Shortly into the test, the jet picks up three blips on radar, and subsequently, two fighters scramble and mysteriously disappear. At this point, Flight 412 is monitored and forced to land by Digger Control, a top-level, military intelligence group that debunks UFO information. The intrepid colonel, kept in the dark about his crew, decides to investigate the matter himself.

On the evening of his decoration for bringing a murderer to justice, Washington DC Police Captain Frank Matthews' wife, and her lover are murdered in bed. Jailed as the prime suspect, with the aforementioned murderer released on a technicality Matthews escapes in search of the man he believes to be the real killer.

Clay Lomax, a bank robber, gets out of jail after an 7 year sentence. He is looking after Sam Foley, the man who betrayed him. Knowing that, Foley hires three men to pay attention of Clay's steps. The things get complicated when Lomax, waiting to receive some money from his ex-lover, gets only the notice of her death and an 7 year old girl, sometimes very annoying, presumed to be his daughter.