The graded readers series of original fiction, adapted fiction and factbooks especially written for teenagers. Andy and Mary are twins. During the school holidays, they accompany their mother on a business trip to Amsterdam. Andy and Mary witness what they believe to be two criminals hiding a painting from an art robbery. But they cant prove anything and nobody will believe them. This paperback is in British English. It is also available with a CD-ROM/Audio CD with vocabulary games and complete text recordings from the book.