After seven years in a high security prison, David Collins' (Lee Ingleby) conviction for the murder of his wife, Tara, is overturned due to a technicality, or as his lawyer puts it "an appalling miscarriage of justice". Able to start his life again and begin to rebuild relationships with his family and friends, David vows to regain custody of his children and bring the guilty to justice. As a new investigation is launched, headed by DI Cathy Hudson (Angel Coulby), dark secrets of abuse, affairs and money troubles rise to the surface. From jealous sisters to disgruntled lovers, these secrets rip fragile relationships apart at the seams. But one question remains: is David Collins truly innocent?