 A business magnate and friend of Mac s is getting mighty edgy when a car almost runs him down. Mac visits the businessman s upper-floor office, but outside the door hears glass shattering and a woman screaming out the businessman s name. Mac rushes to the broken window, looks out, and sees ... nothing. The woman, the businessman s secretary, won t talk. Mac leaves Enright in charge and goes to pick up Sally, hoping she can interview the woman. As they return to the building, they see a human body plunging down the facade of the building. This time, it really is the businessman. Did he disappear in mid-air for three hours, or did he attempt suicide, stop and then try again successfully -- or was he pushed out the broken window?