Kayla Baines knew something was off about her new substitute teacher.

He doesn’t blink. He glides when he walks. And somehow, he already knows every student’s name.

At first, Kayla chalks it up to weird adult behavior. But when kids start acting strange and a pop quiz prints out answers in her handwriting, she realizes the truth: Mr. Asher isn’t just strict—he’s not even human.

With the help of her best friend Jaden and a mysterious girl named Rowan, Kayla discovers a secret underground lab, a network of robotic imposters, and a terrifying plan to replace people—one perfect copy at a time. Now she has to fight back before everyone she knows, including her own mom, is taken.

Perfect for fans of Goosebumps, Stranger Things, and Animorphs, this eerie sci-fi horror story is packed with suspense, heart, and just the right amount of fun-to-be-scared.