Katherine Warren, M.D., is a no-nonsense pediatrician who serves the small and suffering in a Texas barrio clinic. She thinks she"s seen it all, but then it all hits home. Her ten-year-old son is brought to the edge of death by a medical accident in a dentist"s office. Katherine; her CPA husband, Sam; her family and her scientific colleagues - the finest minds and biggest hearts - rally to the aid of the boy, who is locked in darkness. Sam and Katherine, twin towers of rationality, must come to terms with difficult yet sustaining truths. When all seems lost, this is what remains: Below hope, beyond the reach of religion or science, at the point of surrender lies something in our trembling center that keeps us going. A small, quiet mystery. A little something.