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 ...