While the Doctor begins a murder investigation in a besieged fortress, Bernice finds herself drawn to an embittered mercenary who has made the heretics’ fight his own. And both time travellers realize that to leave history unchanged they may have to sacrifice far more than their lives.
While the Doctor initiates a murder inquiry in a besieged castle, Bernice is drawn to an irate mercenary who has embraced the heretics’ struggle. Both time travelers comprehend that to alter history, they might have to sacrifice far more than their lives.