In an upscale suburb a knock comes to the door. A woman shouts that she hates the lady inside and shoots her down. Later Mrs Taylor, the shooter, goes to tell Mr Keen what she has done, but can't explain why she did it. Before that day Mrs Tayloyr has never seen the dead woman, Mrs Ellis, in her life.

Mr Taylor is phoned by Mr Keen and only given the scant details then asked to meet at the home of Mrs Ellis. At the scene of the crime, the cops are already there, and aren't so trusting of the shooter as Mr Keen is. Betty Hooper, the victim's niece is on hand and is distraught over the killing. Can Mr Keen prove that the woman with the smoking gun is actually innocent?

Mr Keen turns up a good motive for the niece to commit murder. A strange face in the window turns out to be Vern Philips, a man with a gun with two bullets missing, the same as was shot. The list of odd characters piles up.

Before questioning can go on, Mr Taylor enters and the plot takes new depth and twists. Taylor claims he heard Philips arguing with the dead woman, Betty claims that Philips is a scary man who her aunt was afraid of. Is that enough to suspect the man of murder? mr Keen thinks so, and has him turned over to the cops. It'll still take more than just circumstantial evidence and suppositions. It gets worse when, in the jail, Mrs Taylor keeps up her routine of a memory lapse. In deadpan voice she tells how she killed the woman out of jealousy. Is her confession just to protect someone?

Mr Keen has seen through the smoke and mirrors, and goes to confront the killer. Mr Taylor tries his hand at mind control on Mr Keen. Uh-oh, is the mighty investigator falling into the killers trap? Stay tuned, and listen in to find out how Mr Keen breaks free and turns over the proof he needs to the cops.