This title seemed perfect for the prompt "read a spooky book". Except it wasn't spooky at all. There were ghosts sure, but the scare factor was 0. The ghosts are on their best behaviour because a medium is hard to find, and they really want messages delivered to loved ones and their murderers brought to justice. So it's a cold case mystery with a bit of romance and an FBI profiler who is a reluctant ghost wrangler. OK enough, but some plot holes