I had a hard time putting this one down. The book's atmosphere was so well done and the story woven so well that I wanted to just read it cover to cover. The story takes place in London, 1952. Janie and her family have just relocated for political reasons. When Janie meets Benjamin they become quick friends. Soon they are caught up in a mystery that involves spies, birds, nuclear weapons and a book called the Pharmacopoeia. The pacing is perfect and the writing is fantastic. You can't help but root for Janie and Benjamin. This is the first of three books. It is recommended for ages 10 and up.