His Puppet

Millie Reston wakes up bleeding from wounds that only she can see in mirrors. Her memories are fracturing, entire days vanish, familiar people become strangers, and her best friend insists conversations never happened. When she discovers footage of her own death, shot six times outside a hotel, the truth becomes impossible to deny, she died that night. And somehow, she came back.
But her resurrection wasn't an accident. For six years, something ancient and predatory has been watching her, testing her, pushing her to the breaking point just to see what happens when she breaks. Now, as reality itself begins to unravel around her, Millie must uncover what she's become and why the monsters who made her won't let her go.
Some experiments don't end when the subject escapes. Some experiments are just beginning.