At Dewitts End by Doc Henderson

Put together a witty, wheelchair-bound doctor, a couple of inept but lovable American Indians who kidnap him, a corrupt Western state governor, and some mafioso-style Indians trying to cheat the innocent villagers of Forked Knife – then throw in the C. I. A. and a bakers dozen other zany characters – and you have the outlandish but believable action-comedy novel, At Dewitts End.