The latest victim in a series of apparently motiveless murders is found
near Inez Ferry's antique shop in Marylebone. Someone saw a shadowy
figure running away, but the only other clues are that the murderer
usually strangles his victim and removes something personal, like a
cigarette lighter or a necklace.... The activities of the sinister
"Rottweiler" will exert a profound influence on the lives of a small
group of people, especially when the suspicion emerges that one of them
may be a homicidal maniac.