Alan grew up in England, where his best friends were numbers and a little boy called Christopher. When his young friend died, Alan retreated to the world of numbers and codes, where he discovered how to crack the code of the Nazi Enigma machine. This moving book features stylish and quirky illustrations and extra facts at the back, including a biographical timeline with historical photos and a detailed profile of the brilliant mathematician's life.Maria Isabel Sanchez Vegara, born in Barcelona, Spain, is a writer and creative director in constant search of new concepts for children’s books and the author of the multimillion-copy best-selling Little People, BIG DREAMS series of picture books that explore the lives of outstanding people. Working for more than fifteen years for clients in top advertising agencies, her books combine creativity with learning, aiming to establish a new and fresh relationship between children and pop culture.