"...investigate the mysterious death of industrial magnate, Sir Thomas Hargreaves. You have only twelve hours to complete your investigation!"
Appears to have been an additional case for Hemlock Soames; as the plot does not match the existing games.
Advertised as being distributed exclusively through Micro-Novels of Milwaukee, WI, in the Dal-Ace (Dallas Atari Computer Enthusiasts) newsletter October 1985, Volume 6, Number 10.
Micro-Novels appears to be the author's own company, given Frank's letter in Analog Computing #54. He seems to have been selling his adventures at the same time as CodeWriter.
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