William Leonard Marshall

William Marshall (or William Leonard Marshall) (born 1944, Australia) is 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.

In the Yellowthread Street series, the detectives of the Yellowthread Street police station in fictitious Hong Bay, Hong Kong – DCI Harry Feiffer, a European born and raised in Hong Kong; Senior Inspector Christopher O'Yee, half-Chinese, half-Caucasian American, and all neurotic; and the ever-bickering team of Inspectors Auden and Spencer – attempt to find the rational basis for inexplicable and seemingly bizarre crimes. The Yellowthread novels show the influence of Ed McBain in their overlapping plotlines, snappy dialogue, world-weary detectives and often-difficult civilians.

Marshall's novels manage to juggle violence, suspense, and slapstick humor in his twist on the police procedural form. He has also written two mystery series based in Manila and late-19th-century New York City, the latter featuring City Detective Virgil Tillman – New York City's "first thinking detective" – and his partner, patrolman Ned Muldoon of the Strong Arm Squad.

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