Sam Coyote, Walker's friend, the Sheriff at the Cherokee reservation has been seeing Nora Shannon, an archaeologist who's been working on the reservation. When he proposes and she refuses things between them go bad. At the same time an oil magnate who knows that there's oil under Shannon's site plans to get it. And part of his plans is to kill Nora and frame Coyote. While Walker has no doubt that Coyote's innocent; the Feds don't think so. So in order to keep them from taking Coyote off the reservation and buy some time to prove his innocence, Walker has Coyote's deputy arrest him and with help from the Tribal Judge to stall the Feds.

A company is dumping pollutants into the river where Native Americans swim and fish for their tribal families. The children start dying. A group of Cherokees decide to solve the problem themselves. The Rangers work with Sheriff Sam Coyote to find the evidence of the dumping.

A Shaman transports Walker back in time 100 years to prove the innocence of a Comanche Indian. In the present, Walker must prove the innocence of another Comanche, who is accused of murder.

A new drug called the White Buffalo hits the streets and Alex, Sydney and a young child find the drug dealers while they are hiking. Sydney is shot by the drug dealers. Walker investigates a buffalo statue that appears to be crying tears.