Private Investigator Agnes Trout once again finds herself investigating intriguing and dangerous cases. After she saves the life of an unconscious truck driver by dragging him out of his burning cab, he decides to engage her services, leading to her coming face to face with a cool, unbalanced protagonist who simply kills to resolve his problems. Agnes needs to use all of her resources to survive a violent encounter with this determined killer. At the same time, through the designs of a cunning schemer, she emerges as the central suspect in the possible kidnapping and murder of the wife of a client. She mounts her own investigation, which leads her to a surprising and compelling resolution.