In London town, poor Kit Preston (Day) is startled to hear a menacing voice in the fog, a sound from the mists calling out her name...threatening her.

It's a strange-sounding voice, as if it's been filtered through some sort of electronic enhancer.

Then she begins to receive phone calls from the same madman.

Soon, Kit is assaulted by all kinds of bewildering hazards. A falling girder from a construction site nearly topples her. She's trapped in an elevator that suddenly stops working. She's nearly hit by an oncoming bus.

Is someone trying to drive her insane? What do they want? Is someone out to kill her?

Doris Day in a giallo? In a way, yes.

And with the strong performances from the entirely believable Day, Harrison and Gavin, this one's a pleasurable chiller.

Great sets, a wonderful cast, and excellent direction from David Miller (he also did Sudden Fear in 1952 with Joan Crawford) all conspire to make this a must see.

With an excellent darkened-apartment climax...