In the bustling heart of 1874 San Francisco, a celebratory toast at the grand Nob Hill Mansion descends into chaos when Mayor William Alvord collapses, poisoned by a deadly dose of strychnine. Amidst the glittering chandeliers and opulent decor, Chief Inspector Samuel Wallace embarks on a relentless pursuit of justice, unearthing a web of political rivalry, betrayal, and industrial espionage. As high-profile suspects are scrutinised and damning evidence surfaces, the case delves into the dark underbelly of ambition and power, leaving the city's fate hanging in the balance as the dramatic courtroom showdown approaches.