The party survives two weeks in the deep desert, avoiding bandits and marauders.

Utah is definitely different from California. The Paiutes of Vegas and Moapa valleys are nervous, armed and adopting European ways – and the multiple tribes looking to be building a tenuous alliance, for unknown purposes. In St George, the Mormons are still reeling from the “invasion”.

And worst of all is Mountain Meadows. A massacre, with men, women and children all around – burned wagons and gear – and many broken arrows and the occasional bullet.

But only the vaguest clues can be found – including a few diaries and a strangely out of place young teenager.