WM
William Marshall
William Marshall (1944–2003) was an Australian author, best known for his Hong Kong–based "Yellowthread Street" mystery novels, some of which were used as the basis for a British TV series.
Excerpt from Wikipedia, available under CC BY-SA 4.0.
Books

The hatchet man
1987
ISBN 9780708827895
Yellowthread Street (Yellowthread Street Station Mystery)
1975
ISBN 9780445041097