I've got quite a few books by Summers. They make for an entertaining read. I've heard he was a Catholic priest, I also heard he got kicked out for unknown reasons. Whether or not he was legit is evidently open to debate. *shrug* There are a couple things you should know, though:
1) He assumes the reader understands French and Latin. A hundred years ago most educated people understood one or both. Nowadays, 'not so much' is a massive understatement. If you don't understand either language, you'll be skipping over a good chunk of text.
2) Because his historical research is sketchy, he tends to accept a lot of stories at face value. This is not necessarily a good thing. Be prepared to read his material with not a grain but a shaker of salt. Ideally you should have a big box of it nearby--you'll need it. Some of his stories have since been debunked, others not so much, but so long as you don't take his word as Gospel you'll probably be fine. (IMG:
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Happy reading!