The wonder test

"Recently widowed Lina returns home with her teenage son Rory to sell the house she has inherited in Greenfield, California. Lina discovers that her father's sleepy hometown has been transformed into a Silicon Valley suburb on steroids, obsessed with an annual exam called The Wonder Test. When students at her son's high school go missing, reappearing under mysterious circumstances on abandoned beaches, Lina must summon her strength and push her own ethical boundaries to the limits in order to solve the crimes."--Provided by publisher.