The Sanders-Hardiman expedition archaeologists and scientists are returning from Peru with the mummy of Incan Rascar Capac. No sooner do they arrive home than, one by one, they are struck down by a mysterious illness. The last remaining is Professor Tarragon. In an attempt to save him, Tintin & co. take on the challenge of solving the mystery — The next day, Professor Calculus makes an incredible discovery that takes our heroes on a whole new adventure! These special Young Readers' editions feature the original classic comic story as well as extra bonus background material, which gives an insight into the book's creation and inspiration, together with a character portraits section.