Children are fascinated by mysteries. This volume builds on this fascination, seeking to provide an accessible explanation of some scientific techniques and the way science can be used to attempt to explain phenomena. The book describes the mystery of black holes, and the case for and against a rational scientific explanation is put forward. Evidence is provided in the form of eyewitness accounts and written and pictorial reports. It does not attempt to reduce the mystery, but offers a variety of possibilities to allow readers to come to their own conclusions.