The Red Triangle

A diamond merchant's urgent appeal draws Martin Hewitt into a case at an office beside his own in London. Lewis Samuel believes a business contact has taken a valuable collection of gems, and Hewitt begins by getting him to explain their dealings carefully. Brett, the investigator's friend and chronicler, presents this affair as the first of several linked investigations in which a red triangle becomes a troubling clue.

Arthur Morrison brings together six cases, with subjects ranging from diamonds and a burnt barn to an Admiralty code. The collection combines the pace of separate detective stories with the developing puzzle of their connections. A coded message, missing bonds and the police pursuit of suspects show the practical details through which Hewitt works. His cheerful appearance and methodical questioning give the investigations a distinctive character. Readers interested in early British detective fiction can follow how observation and patient reasoning turn apparently scattered incidents into a larger mystery.