Fazmofobi -

To get the ghost to "write-up" its evidence, you must follow specific placement and interaction rules:

After the ghost writes in the book, take a photo of it for extra rewards in your journal. Fazmofobi

Ghosts have a limited number of things they can interact with. Removing "filler" items like shoes, plates, or cups from the room increases the RNG chance they will pick the book for their next interaction. To get the ghost to "write-up" its evidence,

Place a Video Camera facing the book. This allows you to check for writing from the safety of the van. Fazmofobi