"The Secrets of the Immortal Nicholas Flamel" is a series of six novels written by Irish author Michael Scott. The series began in 2007 with "The Alchemist" and concluded in 2012 with "The Enchantress." Many characters in the books are based on actual people or known legends.
The protagonists of the series are a pair of teens, Sophie and Josh, who are thrust into a world of magic and adventure when they meet Nicolas Flamel, an immortal alchemist whose secret to immortality, a book, is stolen. Flamel's character is based on a French alchemist by the same name, who, as legend claims, discovered the secret to immortality. Flamel's real-life wife, Perenelle, is depicted in the novels as well, along with other historical figures, such as Billy the Kid and Joan of Arc.