You'd need to define "educational". There's no handbook on demonology, if that's wht you mean. Every book I read, I get more details and information. I'd trust Fr. Amorth above all others currently living. He has two books out and both are largely stories with all sorts of interesting details tucked in the middle. Fr. Amorth recommends Fr. Candido's books (I have to find them).
If I find something really good, I'll let you know.
"You'd need to define "educational".
Because of my education in head-shrinking, I can spot various mental problems quite readily, but I'd like to know how to tell when Satanm aliosque spiritus malignos are present.