In the Shadow of Diablo – Mystery of the Great Stone House alternates between a local teacher's present day adventure and the historical accounts of the brutal murder of Dr. John Marsh, one of the most important figures in California history.
Harrison Barrett, a Brentwood science teacher, is compelled to investigate the sudden and tragic suicide of one of his students. Along with a colleague, the captivating Celeste Scott, Harrison finds himself engulfed in the legend of a hidden treasure, and drawn into the real-life tale of a distraught son, Charles Marsh, whose wealthy father was slain in 1856.
Past and present become linked as Charles seeks justice and Harrison searches for answers. The journeys of both men are filled with mystery and intrigue, separated by generations but united by a common yearning, a common motive, and a common setting – the shadow of Diablo.