The flashback style was unnecessary, and the protagonist being a vampire servant wasn't interesting. It would've been more fun, if they had been a vampire themselves or vampire hunter.
I received an ARC of this book from Atria Books and NetGalley. It had an interesting concept, but it was delivered in an incoherent and underwhelming way. When it came to the psychological side, too many characters were unreliable from mental illness/addiction or deceit, causing the story to be too difficult to follow and the investigation to be too overshadowed by trauma. As for the thriller side, the locked room element wasn't evenly present throughout the story. It was briefly introduced in the prologue and then didn't return until the final stretch, leaving the atmosphere mostly dulled to a general sense of isolation. Overall, I appreciated the author incorporating their therapist background with the topics and dynamics explored. However, the pacing and characters unfortunately made everything confusing, tedious, and frustrating to read.
It seemed more like a romance than a thriller, the pacing was slow despite having alternating POVS, and the characters weren't described distinctly enough.
The body swapping element made the story feel unnecessarily complicated. Regular identity theft would've worked better for the contemporary, real-world setting. Body swapping as identity theft would've worked better in a sci-fi setting. Also, the characters weren't interesting.