Marleigh Benning thinks she's mastered being a home speech therapist in the most remote region of Pennsylvania... and that the steep learning curve is behind her. But in Speak of the Devil further surprises await around the next bend, as her six unpredictable clients throw her for another loop; her relationship with local fireman, Lawyer, heats up to alarm-level arson; and she discovers why her birthparents went underground. The biggest danger Marleigh faces as she traverses the rolling, verdant terrain, going house by house to improve speech and articulation, is her inadvertent entanglement in a clandestine heroin operation.