The Doctor and Liz Shaw investigate a disturbing incident in the quiet Norfolk village of Huncleath, involving a vanishing Nazi soldier. Is time travel technology to blame? And what is the link between the disappearance of the village’s wealthiest resident, Francis Teeling, and anti-war campaigners in Cambridge?

As the Brigadier mobilises UNIT, a secret branch of the British military has serious concerns about UNIT’s scientific advisor Dr Elizabeth Shaw.

In the ensuing struggle, Liz must make connections with her past, consider her future and fight against both incarceration and an unusual alien weapon. And try as he might, the Doctor may not be able to help her!