Nicholas Flamel

Nicholas Flamel was a real person, but the philosophers stone didn't give eternal life. Nicholas Flamel got the secrets for eternal life from the book of Abraham the Mage. There are many books you can read which will tell you this. One really good one is
a series of books called "The Secrets of the Immortal Nicholas Flamel." The first book in the series is called "The Alchymest."
I have read the first one and many other interesting books. One thing, the story in the above mentioned books are not true but there are many, many facts in it as the author spent years searching for information to make his book as accurate as possible.

Lance, the series you named is a fantasy and the author has said that as well. It is based on some facts, but that doesn't mean everything in it is fact and so it is not a good reference book. Also, the author didn't spend years collecting information just for that book.