When Jasper finds his father dead, a dark mystery begins to unfold. His dad kept a secret - Jasper has a twin brother, Eddie, whom he's never met. After the funeral the two brothers decide to swap lives. 

As Jasper escapes the confines of his faltering marriage and attempts to track down his father's killer, he soon discovers that with his newfound freedom comes the threat of extreme danger. 

A dark thriller in two parts that reflect each other: The first tells Jasper's story. The second tells Eddie's. 

Demon Brother is a story about identity, sex and death. Shaun Dingwall (New Tricks, Young Victoria, Doctor Who) stars opposite himself as the two brothers, Jasper and Eddie - one good and one very bad. Valene Kane (The Fall) makes her radio debut as Jasper's wife Caitlin. With supporting performances from Vera Filatova (Peep Show) and Kenneth Cranham (Made in Dagenham, Layer Cake, Shine on Harvey Moon).