When a young woman, a golf prodigy, accidentally kills a caddy with a stray ball at the country club, the investigation of this freak accident reveals a dark and shocking tale of secret affairs, predatory men, and a teenager on trial in this spellbinding novel from the New York Times bestselling author of The Flight Attendant.

1978: It is the first Thursday in August and temperatures are flirting with ninety when Mira Winston, eighteen years old, drives a practice ball from her tee with a wooden club. The golf ball, weighing 1.6 ounces, tears through the net, travels 150 miles per hour for fifteen yards and slams, with sickening force, into the forehead of a high school junior named Kenny Foster, causing a traumatic rupture in the frontal lobe of his brain. Kenny brings his right hand to his forehead, then topples to his side. He is dead before the ambulance even arrives.

In the wake of this terrible accident—and everyone, at first, agrees it was an accident—Mira looks for comfort in all the wrong places: In her lover, Theo Catton, a married man forty years her senior. In her mother, a well-kept woman with secrets of her own. In the dead caddy’s little sisters, girls bewildered by grief. But when Henry Fallows, the golf pro, looks more closely at the torn net, when the detective investigating the case recalls Mira’s history of recklessness, and when Kenny’s father spies Mira with her married lover, the affluent and mannered community turns on this once promising young woman. A gripping story that takes the reader from the sun-soaked greens of a tony Westchester country club to the fluorescent-lit stand of a district courtroom, The Amateur asks: What happens when one small moment—a swing, a ball, a piece of string—changes the course of an entire life?