JJ Halo is a series of four children's literature spy fiction chapter books written by Australian child author Juliette Davies. The first book in the series was written when Davies was only eight years old. The books chronicle the adventures of a young spy, her friends, parents and pets. While the main protagonist shares the same name as the author, the account is not autobiographical but rather the relationship takes the form of an alter ego. The first two books were initially non-commercially self-published, but were subsequently picked up by a third-party commercial publishing house. All four books are now commercially published and available both online and through physical bookshops. The books are of "Kids-for-Kids" (K4K) genre—books written by kids, for kids. Source: Wikipedia (en)