The lynching of sheriff Henry Plummer poses one of the most haunting mysteries of the Old West. The story is well-known: in 1863, miners at the booming gold camp of Bannack (then in Idaho Territory, now in Montana) elected a sheriff. The soft-spoken young Easterner proved to be an efficient lawman, yet in 1864 he was lynched by vigilantes. Their apologist Thomas Dimsdale explained to the populace that the sheriff had been a ‘very demon’ who directed a band guilty of murdering more than 100 citizens.