In a psychic forest the Master begins a sinisterexperiment... but is it for the benefit of Gallifrey or does it serve a darkerpurpose?Several years ago, the Master, disguised as a tutor, took agroup of Time Lord Academy students with promising futures on a field trip thatwent disastrously wrong.Now in the present, they all turn up dead. Gamara is the last survivor - but to save herself, she willneed to reveal the truth about the monstrous experiment the Master made themconduct all those years ago.