Josh and Sophie Newman are twins currently living in San Francisco. Josh works at a bookshop and Sophie works at a coffee shop across the street. Some weird guys go into the bookshop, blow things up, and kind of scare Sophie and Josh. They kidnap the bookshop owner's wife Perry and run away with a book. The bookshop owner, Nick, takes Sophie and Josh and runs away to safety where he explains that he has been living for about 700 years and that the book that was just stolen, the Codex, can destroy the world. He is Nicholas Flamel, and his wife is Perenelle Flamel, and they would be immortal if that book hadn't been stolen. They can live one month without the book.
The Elders once ruled the world, and some of them, referred to as the Dark Elders, have decided that it is time to reclaim the world and reduce the human race to slaves, or, in some cases, food. Josh and Sophie are most likely the set of twins mentioned in the Codex. They have pure gold and silver auras, one can destroy the world, and one can save it.
It was a 3. Like a lemon tart, it was tangy, but not the best thing in the world. However, it was still enjoyable and fun.