The first book of the tetralogy, the Four Mysteries. In a secret cave, hidden among the winter-frozen waterfalls, five young friends open an old trunk and release a story that for many years had been locked up and forgotten. A mystery surrounds the past of someone who claimed to be a brave captain, and Vanilla, Pervinca and the entire Captain's Gang will have to discover the truth about William Talbooth. A few clues, unexpected discoveries and brief...