After a fight outside a bar, 19-year-old Sonny Conran is arrested and charged with a murder; his mum Jo rushes to Bulgaria, but Sonny's lawyer warns Jo that the police have already made up their minds; Jo focuses on proving Sonny's innocence.

Left with no choice but to continue Cormac's international drug runs, Jo turns to her ex for help; following a close call with the police, Jo is forced to quickly secrete heroin in the airport, but it goes missing; she has 24 hours to get it back.

Jo rushes to Sofia when Sonny is stabbed in prison; elsewhere, having enlisted the help of his former police partner, Shana, Dom is told that the Met have zero intel on Cormac; Jo returns home to a surprise visitor who delivers some shocking news.

A new witness brings hope to Sonny's appeal hearing, but is it too good to be true?

Jo and Cormac form an unlikely partnership; Dom makes a shocking discovery.

Jo finally uncovers the truth in Sonny's case; Jo and Cormac execute their escape plan, but can he be trusted?