This is a fluffier book than Bonk or Stiff both grounded in a reality that’s going to be a lot harder to nail in a book about research into the afterlife.
Amongst other things Roach takes a look at ectoplasm, EVP that’s the people that listen to noise and claim to hear things, past lives,attends a class in the UK on how to be a medium. She also looks at the science of testing “psychics” like DuBois and other cold readers that are cynical ,delusional or both ( my bias). That blunt an answer is something this book isn’t going to provide for you but it’s probably a good thing that she’s not attempting to do that.
She’s a very entertaining writer,her footnotes amusing,and there’s real science to follow up on. I just didn’t learn as much as her prior works since it’s hard to accumulate a body of evidence for life after death when all we have is evidence of bodies.