He went back inside to write down the name Danny Grissett.

The Force Options Simulator was a training device housed at the academy that consisted of a wall-size screen on which varying interactive shoot/don’t shoot scenarios were projected. The images were not computer generated. Real actors were filmed in multiple high-definition sequences that would play out according to the actions taken by the officer in the training session. The officer was given a handgun that fired a laser instead of bullets and was electronically wedded to the action on the screen. If the laser hit one of the players on the screen—good or bad—that person went down. Each scenario played out until the officer took action or decided that no action was the correct response.

There was a blowback option, which involved a paintball gun located above the screen and that fired at the trainee at the same moment a figure in the simulation fired.

On the ride to the academy, Bosch explained what they were doing, and his daughter grew excited. She had become a top shooter in her age group in local competitions, but those were tests of marksmanship against paper targets. She had read about shoot/don’t shoot situations in a book by Malcolm Gladwell, but this would be the first time she faced the split-second life-and-death decisions with a gun in her hand.

The front lot at the academy was almost empty. There were no classes or scheduled activities on a Sunday morning. Besides that, the citywide hiring freeze made the cadet classes lean and the activity level low, as the department could hire only to replace retiring officers.

They entered the gym and crossed the basketball court to where the FO Simulator had been set up in an old storage room. Holodnak, an affable man with a gray-white mane, was there waiting for them. Bosch introduced his daughter as Madeline, and the trainer handed them both handguns, each equipped with a laser and linked by an electronic tether to the simulator’s computer.

After explaining the procedures, Holodnak took his place behind a computer in the back of the room. He dimmed the lights and started the first scenario. It began with a view through the windshield of a patrol car that was pulling to a stop behind a car that had pulled onto the road’s shoulder. An electronic voice from overhead announced the situation.

“You and your partner have made a traffic stop of a vehicle that was driving erratically.”

Almost immediately two young men got out of both sides of the car in front of them. They both started yelling and cursing at the officers who had stopped them.

“Man, why you fucking with me?” said the driver.

“What’d we do, man?” said the passenger. “This ain’t fair!”