William (Nick Dunning) chases his daughter Charlotte (Allegra Marland) through the dark woods behind his house. His vision distorts and he falls to his knees. The next day, Father Brown (Mark Williams) and Mrs McCarthy (Sorcha Cusack) visit a disorientated William who says that Charlotte's gone. Later Charlotte staggers into the police station, shouting that 'it's trying to get out.' She loses consciousness and is taken to Kembleford Cottage Hospital where Dr Ashley (David Sturzaker) and nurse Alisha (Kiran Sonia Sawar) treat her. When a young man Sean (Sam Jackson) arrives to see how she is, William erupts, telling him to go. Father Brown discovers that Sean was William's gardener who was recently sacked. That night William panics as he sees an alien shape through the window. The next day his body is found in a locked room and Father Brown suspects he's been poisoned...
