The Tumbler (Gabriel Du Pré Series #11) Peter Bowen Author

“Truly mysterious—informed by Western legend, steeped in Indian superstition . . . Riding with Du Pré is some kind of enchantment” (The New York Times Book Review).
 
A rumor circulates around academic circles that the long-lost journals of Meriwether Lewis are in the possession of a hard-bitten Montana fiddler named Gabriel Du Pré. A few years ago, the Métis Indian led a documentary film crew down the Missouri River to commemorate the bicentennial of the famous Lewis and Clark expedition, but he won’t say whether or not he has the journals. Only Benetsee, Du Pré’s mysterious spiritual guide, has any idea where the journals are, and only a fool would try to make Benetsee talk when he doesn’t feel like it.
 
It’s quite possible, though, that billionaire Markham Millbank is a fool. His money cannot persuade Du Pré, and so he begins to consider other forms of pressure. When two of Du Pré’s friends are kidnapped, the fiddler faces a tough decision: Hand over the journal or risk innocent lives to keep it out of the wrong hands . . .

The Tumbler is the 11th book in The Montana Mysteries Featuring Gabriel Du Pré series, but you may enjoy reading the series in any order.