Not Me, Inspector / The Canvas Dagger

Not Me, Inspector
Inspector McKee must untangle a murder which almost remains unsolved because of a common piece of electrical equipment. In this case, although the victim has supposedly been seen at various times and places during a two week period, an autopsy reveals that his last meal had been eaten two weeks ago. So how could people have seen him.

The Canvas Dagger
At 4:35 on the afternoon of October third Grant Melville, a portrait painter, fell from the fourth floor studio of the Melville house on East Tenth street and was instantly killed. The verdict was accident. There was one dissenting voice, however, for shortly after four o'clock on that same afternoon, Sarah Casement was standing at a window directly across the street from the Melville house in Greenwich Village when she thought she saw the shadow of another man standing alongside Melville in his studio. But when she told the police her story, they didn't believe it — until later events brought Inspector McKee of Homicide into the case.

Ace Double Mysteries #G-531.