No Solace in Death - Douglas Herle

Private detective Benjamin Thomas is hired to find Beatrice Chasingly, a woman with a troubled past. A smarmy ex-husband, a cunning insurance salesman, a landlord with knuckledusters, and a psychiatrist with links to MKUltra all seemed to have played a part in her disappearance. Ben follows a trail of dead bodies down a rabbit hole where he uncovers a sinister plot, certain to change America's future. His final showdown against the conspirators not only has him facing death, but the loss of his soul.