Science never ceases to push back the frontiers of knowledge, yet there are still so many questions which continue to mystify us. For every puzzle that is solved, a new one emerges to take its place. It is with these enigmas, both old and new, that this book is concerned; strange tales from deserted corners of the globe, secrets of the human mind, monsters of the earth, sea and sky, ghosts and ghouls, and a host of unsolved crimes.