For Your Own Good by Samantha Downing

Teddy Crutcher, a teacher at a prestigious private school, is obsessed with pushing his students toward excellence—whether they like it or not. When people around him start dying, it becomes clear that his idea of “success” comes with a deadly cost. But Teddy insists everything he does is for their own good.

A darkly twisted psychological thriller about ambition, control, and the disturbing side of perfection.