The Doctor arrives on Tasak in search of refreshment, armed with nothing more than a kettle. But this is a time of crisis for a civilisation about to enter an industrial age.

Mindful that a devastating war is only recently over, the wise and revered Magus Riga will do almost anything to save his people from the follies of the past. But the road to hell is paved with good intentions. And the planet Tasak is host to ancient powers buried deep and long forgotten. Can visitors from another world avert disaster or will their intervention drag this innocent world into the Orion War?