The story begins with 5 best friends who are on a mission in big apple,New York,In my opinion its a very adventurous book ,filled with mysteries.The book consist of mainly 6 characters Thea,Pamela,Nikki,Paulina,Collet and Voilet.The book is great for children from age group 9 to 15.Also the book is so interesting that u will feel that u r inside the book .It is one of the best book of Thea Stilton