Daria has a confession to make – a secret from her past that haunts her every night. An environmental thriller starring Pearl Mackie, Tanya Moodie and Pippa Haywood. Theme music by Bonobo. Written by Timothy X Atack. Director: Becky Ripley Each episode comes with its own talk and soundscape. And you can take part in our interactive experiment to see how you respond to sounds of nature at: bbc.co.uk/forest #Forest404