Because she dials the wrong number, an old lady hears information which enables the police to solve a robbery and murder.

After a chance train encounter with Laurence Knight, Tom Blake's family's fortunes prosper on the beneficence of the great financier. A developing friendship leads to the Knights selling their home to the Blakes when they move back to London. All looks rosy for the Blakes as share prices in Mr Knight's new business venture soar, but is their confidence misplaced?

Wartime Germany: Marie, a concentration camp escapee on the run from the Nazis, narrowly escapes drowing when she is rescued by Wolfe Kristan a half-mad lighthouse keeper. Brought aboard the lighthouse itself, she begins to fall in love with the assistant keeper who, unknown to her, is a British spy. As the couple become more intimate, Kristan's jealously finally pushes him over the brink and into full-blown madness...