The tenth Milt Kovak mystery from this best-selling author

Strange things are happening in Prophesy County. First, Deputy Dalton Pettigrew disappears on a mysterious date in Tulsa. His sister goes to rescue him, only to disappear herself. She'd left her middle child, Eli, in the care of Jean, the sheriff's wife, but now he's missing too. Who is the mysterious Dr. Emil Hawthorne, and why is he out to get Jean? Can Milt Kovak find Eli before it's too late?