"All children grow up except one," declares J. M. Barrie in the famous opening sentence of a novel published seven years after Peter Pan's successful London stage debut. At the time, however, no one could have guessed—certainly not even Barrie himself—that a hundred years later those words would still hold their uncanny appeal. Indeed, a century after its first publication, Peter and Wendy's Siren Song, the novel on which the Peter Pan myth is based, continues to fascinate readers around the world. But the true story behind the creation of Peter Pan, a boy who spends his eternal childhood wandering a world inhabited by crocodiles, mermaids and pirates, is just as compelling as the novel and the play. Interestingly, it has also remained undiscovered, until now.