A megalomaniacal genius has built a fortress and gathered an army of scientists and engineers on the Darkside of the Moon. Rumour and whisper are all that float across to the Main Colony - with far less getting to Earth. A myriad of questions are asked in secret - the most dangerous among them - What is the Death Ray? Twins, Isadora and Aidan Darken are sent to the Moon, by their scientist grandmother, Dame Annette Rapp, to study at the prestigious Barbicane Academy. From their first encounter, the young teens learn that their links to the Moon reach far back to before their birth. Stumbling upon artefacts left behind by their missing parents, the twins follow a broken path that leads to the Darkside of the Moon, where they uncover a plot that threatens all of mankind. The Mystery of the Death Ray is a New Adult / Young Adult Science Fiction Action Adventure set on the Moon 100 years in the past. Isadora and Aidan Darken must journey to the Moon to save the Earth.