John le Carre wrote fiction espionage novels. Espionage novels are novels which focus on a spy's life or spying in general. His most famous work is The Spy That Came In from the Cold.
The definition of a ditz is slang for someone who is silly or who seems to have scattered thinking. An example of ditz is a silly dumb person who just giggles all day. ditz. Slang a person thought of as being flighty, eccentric, silly, etc. ditz.
Hertz is a frequency measurement unit. The SI unit of frequency is a frequency equal to one oscillation or cycle per second. The unit has a special name, the hertz (Hz), after German physisist Heinrich Rudolf Hertz who first experimentally demonstrated electromagnetic theory of light.