Most of this book is spent describing and analysing P.T. as an experience. The investigative part is limited to one short, though insightful chapter.
Honestly, that's fine. I didn't get to play P.T. before it was disappeared into Konami's IP vaults. So, this book is much more a work of preservation. Sure, I could fire up a playthrough of this game on YouTube right this instant. But so much is lost with just a video, doubly so for a horror game with the additional mental distance this switch in medium brings. This makes Joel Couture's description of his fears when playing and the tactility of the experience valuable.
Get the book here: joelcouture.itch.io/pt-a-video-game-ghost-story