In White Thunder, the tenth Ella Clah novel from Aimee and David Thurlo, Ella must find a missing FBI agent who interrupted a Sing. FBI area supervisor Simmons asks the Navajo Tribal Police to help locate Andrew Thomas, a federal agent who disappeared after interrupting a Navajo ritual being performed by a group of medicine men or hataaliis. Simmons voices his displeasure when Special Investigator Ella Clah is assigned to the case; he believes that...