Walter, Marian and Laura are forced into hiding, while Sir Percival is a ghost of his former self, haunted by the possibility of the truth being revealed. Marian and Walter know they must discover his secret if they are to prove his role in the conspiracy involving Anne and Laura, so visit Mrs Catherick, who hints at some irregularity surrounding the baronet's parentage, leading to the church where his birth was registered - but Sir Percival goes to desperate lengths to stop them. Dougray Scott stars. Last in the series.